Iouri Galperine

• Drichko, I. L.; Smirnov, I. Y.; Suslov, A. V.; Baldwin, K. W.; Pfeiffer, L. N. & West, K. W. [Show all 7 contributors for this article] (2023). Coexistence of two hole phases in high-quality p-GaAs/AlGaAs in the vicinity of Landau-level filling factors ν=1 and ν=(1/3). Physical review B (PRB). ISSN 2469-9950. 107(8). doi: 10.1103/PhysRevB.107.085301. Full text in Research Archive
• Drichko, I.L.; Smirnov, I. Yu.; Galperin, Yuri; Dementev, P.A. & Rybin, M.G. (2023). Low Temperature Electrical Properties of CVD Graphene on LiNbO<inf>3</inf>: Acoustic Studies. Semiconductors (Woodbury, N.Y.). ISSN 1063-7826. 57(3), p. 184–191. doi: 10.1134/S1063782623030077. Full text in Research Archive
• Drichko, I. L.; Smirnov, I. Y.; Galperin, Yuri; Dementev, P. A. & Rybin, M. G. (2022). Low Temperature Electrical Properties of CVD Graphene on LiNbO3: Acoustic Studies. Semiconductors. ISSN 0015-3222. 2022(1). doi: 10.21883/SC.2022.01.53027.9733. Full text in Research Archive
• Smirnov, I. Y.; Drichko, I. L.; Suslov, A. V.; Pfeiffer, L. N.; West, K. W. & Galperin, Yuri (2022). Effect of the strong electron correlations on the formation of Wigner crystal in n-GaAs/AlGaAs structure: Surface Acoustic Waves studies. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 2164(1). doi: 10.1088/1742-6596/2164/1/012021. Full text in Research Archive Show summary

  Abstract The complex high-frequency conductance of high-mobility n-GaAs/AlGaAs heterostructures was determined in magnetic fields 12–18 T using the Surface Acoustic Waves technique. Analysis of frequency and temperature dependences of conductance showed that in the investigated magnetic field range and at low temperatures, T&lt;200 mK, the electron system forms a Wigner crystal deformed due to pinning by disorder. We have also defined an effective melting temperature of the Wigner crystal.

• Colauto, F.; Carmo, D.; Andrade, AMH De; Oliveira, AAM; Ortiz, W. A. & Galperin, Yuri [Show all 7 contributors for this article] (2021). Measurement of critical current flow and connectivity in systems of joined square superconducting plates. Physica. C, Superconductivity. ISSN 0921-4534. 589. doi: 10.1016/j.physc.2021.1353931. Full text in Research Archive Show summary

  A method to measure the electrical connectivity between square superconducting plates joined by weak link interfaces is presented. It is based on observation of lines where the flow of critical current abruptly changes direction due to the presence of weak links, and the confinement created by the shape of the sample. The method is demonstrated using magneto-optical imaging (MOI) of systems consisting of up to 2 x 2 plates joined to form a larger square. The samples used in this study are Nb films with weak links created by focused ion beam machining. Common features are found in the current flow patterns, which allow to measure the electrical connectivity between the plates by observing an angle between pairs of lines indicating where the current abruptly changes flow direction, so-called discontinuity, or d-lines.

• Varlamov, A. A.; Galperin, Yuri; Sharapov, S. G. & Yerin, Yuriy (2021). Concise guide for electronic topological transitions. Low Temperature Physics. ISSN 1063-777X. 47(8), p. 731–743. doi: 10.1063/10.0005556. Full text in Research Archive
• Hou, Jie; Abie, Sisay Mebre; Strand-Amundsen, Runar James; Galperin, Yuri; Bergli, Joakim & Schuelke, Christin [Show all 8 contributors for this article] (2021). Temperature dependence of the microwave dielectric properties of γ -aminobutyric acid. Scientific Reports. 11(1). doi: 10.1038/s41598-021-97178-7. Full text in Research Archive Show summary

  The GABA molecule is the major inhibitory neurotransmitter in the mammalian central nervous system. Through binding to post-synaptic neurons, GABA reduces the neuronal excitability by hyperpolarization. Correct binding between the GABA molecules and its receptors relies on molecular recognition. Earlier studies suggest that recognition is determined by the geometries of the molecule and its receptor. We employed dielectric relaxation spectroscopy (DRS) to study the conformation and dielectric properties of the GABA molecule under physiologically relevant laboratory conditions. The dielectric properties of GABA investigated have given us new insights about the GABA molecule, such as how they interact with each other and with water molecules at different temperatures (22°C and 37.5°C). Higher temperature leads to lower viscosity, thus lower relaxation time. The change in the GABA relaxation time due to concentration change is more associated with the solution viscosity than with the GABA dipole moment. A resonance behavior was observed with high GABA concentrations at physiological temperature, where there might be a phase transition at a certain temperature for a given GABA concentration that leads to a sudden change of the dielectric properties.

• Kavokin, A. V.; Galperin, Yuri & Varlamov, A. A. (2020). Proposed model of the giant thermal Hall effect in two-dimensional superconductors: An extension to the superconducting fluctuations regime. Physical Review Letters. ISSN 0031-9007. 125. doi: 10.1103/PhysRevLett.125.217005. Full text in Research Archive Show summary

  We extend the thermodynamic approach for the description of the thermal Hall effect in two-dimensional superconductors above the critical temperature, where fluctuation Cooper pairs contribute to the conductivity, as well as in disordered normal metals where the particle-particle channel is important. We express the Hall heat conductivity in terms of the product of temperature derivatives of the chemical potential and of the magnetization of the system. Based on this general expression, we derive the analytical formalism that qualitatively reproduces the superlinear increase of the thermal Hall conductivity with the decrease of temperature observed in a large variety of experimentally studied systems [Grissonnanche et al., Nature (London) 571, 376 (2019)]. We also predict a nonmonotonic behavior of the thermal Hall conductivity in the regime of quantum fluctuations, in the vicinity of the second critical field and at very low temperatures.

• Drichko, I. L.; Smirnov, I. Y.; Bakarov, AK; Bykov, AA; Dmitriev, AA & Galperin, Yuri (2020). Nonlinear AC and DC Conductivities in a Two-Subband n-GaAs/AlAs Heterostructure. JETP Letters. ISSN 0021-3640. 112(1), p. 45–52. doi: 10.1134/s0021364020130068. Full text in Research Archive
• Anghel, D.-V.; Kulikov, K.; Galperin, Yuri & Kuzmin, L. S. (2020). Electromagnetic radiation detectors based on Josephson junctions: Effective Hamiltonian. Physical review B (PRB). ISSN 2469-9950. 101. doi: 10.1103/PhysRevB.101.024511. Full text in Research Archive Show summary

  We theoretically analyze two setups of low-energy single-photon counters based on Josephson junctions (JJs). For this, we propose two simple and general models based on the macroscopic quantum tunneling formalism (MQT). The first setup is similar to the photon counter based on the “cold-electron bolometer” (CEB), where the JJ replaces the CEB in the center of the superconducting antenna. In the second setup, the JJ is capacitively coupled to the antenna. We derive the Hamiltonians for the two setups, and we write the Schrödinger equations, taking into account both the antenna and the JJ. The quantum particles of the MQT models move in two-dimensional potential landscapes, which are parabolic along one direction and may have the form of a washboard potential along another direction. Such a potential landscape has a series of local minima, separated by saddle points. If the particle is prepared in the initial state in the metastable “ground state” of a local minimum, then the photon absorption causes it to jump into an excited state. If the excitation energy is bigger than the potential barrier seen by the quantum particle (the difference between the ground state and the saddle point), the photon is detected. The models are simple and allow us to do mostly analytical calculations. We show that the two setups are equivalent from the MQT point of view since one Hamiltonian can be transformed into the other by changes in variables. For typical values of the JJ and antenna parameters, the setups may work as counters of photons of wavelengths up to at least 1 cm. Dark count rates due to the phase particle tunneling directly from the ground state into the running state have also been evaluated.

• Colauto, Fabiano; Carmo, D.; Andrade, A; Oliveira, AAM; Ortiz, Wilson Aires & Galperin, Yuri [Show all 7 contributors for this article] (2019). Anisotropic flux penetration in superconducting Nb films with frozen-in in-plane magnetic fields. IEEE Transactions on Applied Superconductivity (TAS). ISSN 1051-8223. 29(5), p. 1–5. doi: 10.1109/TASC.2019.2898092. Full text in Research Archive Show summary

  The magnetic anisotropy of superconducting niobium films of different thickness was investigated using magneto-optical imaging. A wide range of anisotropic behaviors was generated by freezing in different in-plane external magnetic fields with magnitude up to 1.12 kOe. The critical fields for the parallel configuration of the different samples were calculated, taking into account the strong deviation of the superconducting properties at small thicknesses. Above their lower in-plane critical field, the films are in the mixed state containing coplanar vortices. In structurally isotropic Nb films, when applying a perpendicular magnetic field, the frozen-in vortices were seen to guide the perpendicular ones. It is shown that the anisotropy increases with both the film thickness and the magnitude of the in-plane field. The results demonstrate that the field-induced anisotropy is a highly versatile way to manipulate vortex matter in film superconductors.

• Mikhailin, N. Yu.; Galperin, Yuri; Kozub, V. I.; Kumzerov, Yu. A.; Volkov, M. P. & Romanov, S. G. [Show all 8 contributors for this article] (2019). Low-Temperature Magnetic Properties of Superconducting Indium Nanocomposites in Opal Matrix. Journal of Experimental and Theoretical Physics. ISSN 1063-7761. 128(5), p. 761–766. doi: 10.1134/S1063776119040034. Full text in Research Archive
• Kozub, V. I. & Galperin, Yuri (2019). Coulomb Drag in Mesoscopic Hopping Insulators. Journal of Low Temperature Physics. ISSN 0022-2291. 198, p. 209–223. doi: 10.1007/s10909-019-02292-6. Full text in Research Archive
• Anghel, D.-V.; Caraiani, C. & Galperin, Yuri (2019). Crossover temperature in the electron-phonon heat exchange in layered nanostructures. Physica Scripta. ISSN 0031-8949. 94(10). doi: 10.1088/1402-4896/ab2346. Full text in Research Archive
• Drichko, Irina L.; Smirnov, Ivan Yu.; Suslov, Alexey V.; Kamburov, Dobromir; Baldwin, Kirk W & Pfeiffer, Loren N. [Show all 8 contributors for this article] (2019). Composite fermions in a wide quantum well in the vicinity of the filling factor 1/2. Solid State Communications. ISSN 0038-1098. 301, p. 1–5. doi: 10.1016/j.ssc.2019.113698. Full text in Research Archive
• Galperin, Yuri; Grassano, D,; Gusynin, V. P.; Kavokin, A. V.; Pulci, O. & Sharapov, S. G. [Show all 8 contributors for this article] (2018). Entropy Signatures of Topological Phase Transitions. Journal of Experimental and Theoretical Physics. ISSN 1063-7761. 127(5), p. 958–983. doi: 10.1134/S1063776118110134. Full text in Research Archive
• Carmo, D.; Colauto, Fabiano; Andrade, Adnei Melges H. De; Oliveira, Alessandro AM; Ortiz, Wilson Aires & Galperin, Yuri [Show all 7 contributors for this article] (2018). Active control of thermomagnetic avalanches in superconducting Nb films with tunable anisotropy. Superconductors Science and Technology. ISSN 0953-2048. 31(11), p. 1–7. doi: 10.1088/1361-6668/aadffa. Full text in Research Archive
• Kozub, V. I.; Galperin, Yuri & Vinokur, V. M. (2018). Coulomb blockade-tuned indirect exchange in ferromagnetic nanostructures. Journal of Magnetism and Magnetic Materials. ISSN 0304-8853. 465, p. 304–308. doi: 10.1016/j.jmmm.2018.06.022. Full text in Research Archive
• Drichko, Irina L.; Dmitriev, Alexandr A.; Malysh, V.A.; Smirnov, Ivan Yu.; Galperin, Yuri & Känel, Hans von [Show all 9 contributors for this article] (2018). Universal frequency dependence of the hopping AC conductance in p-Ge/GeSi structures in the integer quantum Hall effect regime. Journal of Experimental and Theoretical Physics. ISSN 1063-7761. 126(2), p. 246–254. doi: 10.1134/S1063776118010144. Full text in Research Archive Show summary

  "Original Russian Text © I.L. Drichko, A.A. Dmitriev, V.A. Malysh, I.Yu. Smirnov, Yu.M. Galperin, H. von Känel, M. Kummer, G. Isella, D. Chrastina, 2018, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2018, Vol. 153, No. 2, pp. 294–303."/tøf

• Kozub, V. I.; Muradov, M. I. & Galperin, Yuri (2018). Electron drag in ferromagnetic structures separated by an insulating interface. Journal of Magnetism and Magnetic Materials. ISSN 0304-8853. 456, p. 257–262. doi: 10.1016/j.jmmm.2018.02.047. Full text in Research Archive
• Mikhailin, N. Yu; Shamshur, D. V.; Parfen'ev, R.V.; Kozub, V. I.; Galperin, Yuri & Kumzerov, Yu A. [Show all 7 contributors for this article] (2018). Size Dependences of the Magnetic Properties of Superconducting Lead-Porous Glass Nanostructures. Physics of the solid state. ISSN 1063-7834. 60(6), p. 1068–1072. doi: 10.1134/S1063783418060215. Full text in Research Archive
• Vestgården, Jørn Inge; Johansen, Tom Henning & Galperin, Yuri (2018). Nucleation and propagation of thermomagnetic avalanches in thin-film superconductors (Review Article). Low Temperature Physics. ISSN 1063-777X. doi: 10.1063/1.5037549. Full text in Research Archive Show summary

  Stability of the vortex matter—magnetic flux lines penetrating into the material—in type-II superconductor films is crucially important for their application. If some vortices get detached from pinning centres, the energy dissipated by their motion will facilitate further depinning, and may trigger an electromagnetic breakdown. In this paper, we review recent theoretical and experimental results on development of the above mentioned thermomagnetic instability. Starting from linear stability analysis for the initial critical-state flux distribution we then discuss a numerical procedure allowing to analyze developed flux avalanches. As an example of this approach we consider ultra-fast dendritic flux avalanches in thin superconducting disks. At the initial stage the flux front corresponding to the dendrite's trunk moves with velocity up to 100 km/s. At later stage the almost constant velocity leads to a specific propagation regime similar to ray optics. We discuss this regime observed in superconducting films coated by normal strips. Finally, we discuss dramatic enhancement of the anisotropy of the flux patterns due to specific dynamics. In this way we demonstrate that the combination of the linear stability analysis with the numerical approach provides an efficient framework for understanding the ultra-fast coupled nonlocal dynamics of electromagnetic fields and dissipation in superconductor films.

• Drichko, Irina L.; Smirnov, Ivan Yu.; Suslov, Alexey V.; Galperin, Yuri; Pfeiffer, Loren N. & West, Ken W. (2017). Nature of localized states in two-dimensional electron systems in the quantum Hall regime: Acoustic studies. Low Temperature Physics. ISSN 1063-777X. 43(1), p. 86–94. doi: 10.1063/1.4975107. Full text in Research Archive
• Shchurova, Ljudmila & Galperin, Yuri (2017). Electron Concentration Profiles in Modulation Doped Structures With Wide Quantum Well. Physica Status Solidi. C, Current topics in solid state physics. ISSN 1610-1634. 14(9). doi: 10.1002/pssc.201700190. Full text in Research Archive
• Sørdal, Vegard Børve; Bergli, Joakim & Galperin, Yuri (2017). Influence of measurement error on Maxwell's demon. Physical Review E (PRE). ISSN 2470-0045. 95(6). doi: 10.1103/PhysRevE.95.062129. Full text in Research Archive Show summary

  In any general cycle of measurement, feedback, and erasure, the measurement will reduce the entropy of the system when information about the state is obtained, while erasure, according to Landauer's principle, is accompanied by a corresponding increase in entropy due to the compression of logical and physical phase space. The total process can in principle be fully reversible. A measurement error reduces the information obtained and the entropy decrease in the system. The erasure still gives the same increase in entropy, and the total process is irreversible. Another consequence of measurement error is that a bad feedback is applied, which further increases the entropy production if the proper protocol adapted to the expected error rate is not applied. We consider the effect of measurement error on a realistic single-electron box Szilard engine, and we find the optimal protocol for the cycle as a function of the desired power P and error ɛ.

• Lara, Antonio; Aliev, Farkhad G.; Moshchalkov, Victor V. & Galperin, Yuri (2017). Thermally Driven Inhibition of Superconducting Vortex Avalanches. Physical Review Applied. 8(3). doi: 10.1103/PhysRevApplied.8.034027. Full text in Research Archive Show summary

  Complex systems close to their critical state can exhibit abrupt transitions—avalanches—between their metastable states. It is a challenging task to understand the mechanism of the avalanches and control their behavior. Here, we investigate microwave stimulation of avalanches in the so-called vortex matter of type-II superconductors—a system of interacting Abrikosov vortices close to the critical (Bean) state. Our main finding is that the avalanche incubation strongly depends on the excitation frequency, a completely unexpected behavior observed close to the so-called depinning frequencies. Namely, the triggered vortex avalanches in Pb superconducting films become effectively inhibited approaching the critical temperature or critical magnetic field when the microwave stimulus is close to the vortex depinning frequency. We suggest a simple model explaining the observed counterintuitive behaviors as a manifestation of the strongly nonlinear dependence of the driven vortex core size on the microwave excitation intensity. This paves the way to controlling avalanches in superconductor-based devices through their nonlinear response. © 2017 American Physical Society

• Andrianov, G.O.; Galperin, Yuri; Kozub, Veniamin I.; Mikhaylin, N. Y.; Parfeniev, R. V. & Shamshur, Dmitrii V. [Show all 7 contributors for this article] (2017). Exponential increase of resistance at temperature decrease and superconductivity in In-doped Pb0.45Sn0.55Te. Journal of Experimental and Theoretical Physics. ISSN 1063-7761. 125(6 (12)), p. 1137–1143. doi: 10.1134/S1063776117120123. Full text in Research Archive
• Abie, Sisay Mebre; Bergli, Joakim; Galperin, Yuri & Martinsen, Ørjan Grøttem (2016). Universality of AC conductance in human hair. Biomedical Engineering & Physics Express. 2. doi: 10.1088/2057-1976/2/2/027002. Full text in Research Archive
• Pekola, Jukka P.; Muratore-Ginanneschi, Paolo; Kupiainen, Antti & Galperin, Yuri (2016). Energy fluctuations of a finite free-electron Fermi gas. Physical Review E (PRE). ISSN 2470-0045. 94:022123(2). doi: 10.1103/PhysRevE.94.022123. Full text in Research Archive
• Pekola, Jukka P.; Suomela, Samu & Galperin, Yuri (2016). Finite-size bath in Qubit thermodynamics. Journal of Low Temperature Physics. ISSN 0022-2291. 184(5-6), p. 1015–1029. doi: 10.1007/s10909-016-1618-5. Full text in Research Archive
• Drichko, I. L.; Smirnov, I. Y.; Suslov, A.V.; Galperin, Yuri; Pfeiffer, L.N. & West, K.W. (2016). Melting of Wigner crystal in high-mobility n-GaAs/AlGaAs heterostructures at filling factors 0.18 > ν > 0.125: Acoustic studies. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 94(7). doi: 10.1103/PhysRevB.94.075420. Full text in Research Archive
• Varlamov, A A; Kavokin, A V & Galperin, Yuri (2016). Quantization of entropy in a quasi-two-dimensional electron gas. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 93. doi: 10.1103/PhysRevB.93.155404. Full text in Research Archive Show summary

  We demonstrate that the entropy per electron of a two-dimensional electron gas (2DEG) exhibits quantized peaks at resonances between the chemical potential and electron levels of size quantization. In the limit of no scattering, the peaks depend only on the subband quantization number and are independent of material parameters, shape of the confining potential, electron effective mass, and temperature. The quantization of entropy per electron is a signature of a Lifshitz phase transition in a 2DEG. In the presence of stationary disorder, the magnitude of peaks decreases. Its deviation from the quantized values is a direct measure of the disorder induced smearing of the electronic density of states. ©2016 American Physical Society

• Mikheenko, Pavlo; Vestgården, Jørn Inge; Chaudhuri, Saumyadip; Maasilta, Ilari J.; Galperin, Yuri & Johansen, Tom Henning (2016). Metal frame as local protection of superconducting films from thermomagnetic avalanches. AIP Advances. 6:032304. doi: 10.1063/1.4943549. Full text in Research Archive Show summary

  Thermomagnetic avalanches in superconducting films propagating extremely fast while forming unpredictable patterns, represent a serious threat for the performance of devices based on such materials. It is shown here that a normal-metal frame surrounding a selected region inside the film area can provide efficient protection from the avalanches during their propagation stage. Protective behavior is confirmed by magneto-optical imaging experiments on NbN films equipped with Cu and Al frames, and also by performing numerical simulations. Experimentally, it is found that while conventional flux creep is not affected by the frames, the dendritic avalanches are partially or fully screened by them. The level of screening depends on the ratio of the sheet conductance of the metal and the superconductor in the resistive state, and for ratios much larger than unity the screening is very efficient.

• Sørdal, Vegard Børve; Bergli, Joakim & Galperin, Yuri (2016). Cooling by heating: Restoration of the third law of thermodynamics. Physical Review E (PRE). ISSN 2470-0045. 93(3). doi: 10.1103/PhysRevE.93.032102. Full text in Research Archive Show summary

  We have made a simple and natural modification of a recent quantum refrigerator model presented by Cleuren et al. [Phys. Rev. Lett. 108, 120603 (2012)]. The original model consist of two metal leads acting as heat baths and a set of quantum dots that allow for electron transport between the baths. It was shown to violate the dynamic third law of thermodynamics (the unattainability principle, which states that cooling to absolute zero in finite time is impossible). By taking into consideration the finite energy level spacing Δ, in metals we restore the third law while keeping all of the original model's thermodynamic properties intact down to the limit of kBT∼Δ, where the cooling rate is quenched. The spacing Δ depends on the confinement of the electrons in the lead and therefore, according to our result larger samples (with smaller level spacing), could be cooled efficiently to lower absolute temperatures than smaller ones. However, a large lead makes the assumption of instant equilibration of electrons implausible; in reality one would only cool a small part of the sample and we would have a nonequilibrium situation. This property is expected to be model independent and raises the question whether we can find an optimal size for the lead that is to be cooled. ©2016 American Physical Society

• Vestgården, Jørn Inge; Galperin, Yuri & Johansen, Tom Henning (2016). Oscillatory regimes of the thermomagnetic instability in superconducting films. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. doi: 10.1103/PhysRevB.93.174511. Full text in Research Archive Show summary

  The stability of superconducting films with respect to oscillatory precursor modes for thermomagnetic avalanches is investigated theoretically. The results for the onset threshold show that previous treatments of nonoscillatory modes have predicted much higher thresholds. Thus, in film superconductors, oscillatory modes are far more likely to cause thermomagnetic breakdown. This explains the experimental fact that flux avalanches in film superconductors can occur even at very small ramping rates of the applied magnetic field. Closed expressions for the threshold magnetic field and temperature, as well oscillation frequency, are derived for different regimes of the oscillatory thermomagnetic instability.

• Drichko, I. L.; Smirnov, I. Y.; Suslov, A.V.; Pfeiffer, L.N.; West, K.W. & Galperin, Yuri (2015). Crossover between localized states and pinned Wigner crystal in high-mobility n-GaAs/AlGaAs heterostructures near filling factor ν = 1. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 92(20). doi: 10.1103/PhysRevB.92.205313. Full text in Research Archive
• Drichko, I. L.; Smirnov, I. Y.; Suslov, A. V.; Pfeiffer, L.N.; West, K. W. & Galperin, Yuri (2015). Wigner crystal in a two-dimensional electron system in the vicinity of filling factor 1/5: Acoustic studies. Solid State Communications. ISSN 0038-1098. 213-214, p. 46–50. doi: 10.1016/j.ssc.2015.04.018. Full text in Research Archive
• Stepina, NP; Valkovskii, VV; Galperin, Yuri; Smagina, ZhV & Dvurechenskii, AV (2015). Conductance through chains of Ge/Si quantum dots: Crossover from one-dimensional to quasi-one-dimensional hopping. JETP Letters. ISSN 0021-3640. 101(1), p. 22–26. doi: 10.1134/S0021364015010142. Full text in Research Archive
• Pekola, J. P.; Masuyama, Y.; Nakamura, Y.; Bergli, Joakim & Galperin, Yuri (2015). Dephasing and dissipation in qubit thermodynamics. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. ISSN 1539-3755. 91(6). doi: 10.1103/PhysRevE.91.062109. Full text in Research Archive
• Mikheenko, Pavlo; Johansen, Tom Henning; Chaudhuri, S.; Maasilta, IJ & Galperin, Yuri (2015). Ray optics behavior of flux avalanche propagation in superconducting films. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 91(6). doi: 10.1103/PhysRevB.91.060507. Full text in Research Archive Show summary

  Experimental evidence of wave properties of dendritic flux avalanches in superconducting films is reported. Using magneto-optical imaging the propagation of dendrites across boundaries between a bare NbN film and areas coated by a Cu layer was visualized, and it was found that the propagation is refracted in full quantitative agreement with Snell’s law. For the studied film of 170 nm thickness and a 0.9 μmthick metal layer, the refractive index was close to n = 1.4. The origin of the refraction is believed to be caused by the dendrites propagating as an electromagnetic shock wave, similar to damped modes considered previously for normal metals. The analogy is justified by the large dissipation during the avalanches raising the local temperature significantly. Additional time-resolved measurements of voltage pulses generated by segments of the dendrites traversing an electrode confirm the consistency of the adopted physical picture.

• Paladino, E.; Galperin, Yuri; Falci, G. & Altshuler, Boris (2014). 1/f noise: Implications for solid-state quantum informationnoise: Implications for solid- state quantum information. Reviews of Modern Physics. ISSN 0034-6861. 86, p. 361–418. doi: 10.1103/RevModPhys.86.361. Full text in Research Archive
• Drichko, IL; Diakonov, AM; Malysh, VA; Smirnov, I Yu; Galperin, Yuri & Ilyinskaya, ND [Show all 9 contributors for this article] (2014). Contactless measurement of alternating current conductance in quantum Hall structures. Journal of Applied Physics. ISSN 0021-8979. 116(15). doi: 10.1063/1.4898737. Full text in Research Archive
• Vestgården, Jørn Inge; Mikheenko, Pavlo; Galperin, Yuri & Johansen, Tom Henning (2014). Inductive braking of thermomagnetic avalanches in superconducting films. Superconductors Science and Technology. ISSN 0953-2048. 27(5). doi: 10.1088/0953-2048/27/5/055014. Full text in Research Archive
• Bergli, Joakim & Galperin, Yuri (2014). Universal scaling form of AC response in variable range hopping. AIP Conference Proceedings. ISSN 0094-243X. 1610, p. 41–41. doi: 10.1063/1.4893508. Full text in Research Archive
• Kytin, V.G; Kulbachinskii, V.A; Reukova, O.V; Galperin, Yuri; Johansen, Tom Henning & Diplas, Spyridon [Show all 7 contributors for this article] (2014). Conducting properties of In2O3:Sn thin films at low temperatures. Applied Physics A: Materials Science & Processing. ISSN 0947-8396. 114(3), p. 957–964. doi: 10.1007/s00339-013-7799-8. Full text in Research Archive Show summary

  Electrical conductivity, Hall effect and magnetoresistance of In2O3:Sn thin films deposited on a glass substrates at different temperatures and oxygen pressures, have been investigated in the temperature range 4.2–300 K. The observed temperature dependences of resistivity for films deposited at 230 °C as well as at nominally room temperatures were typical for metallic transport of electrons except temperature dependence of resistivity of the In2O3:Sn film deposited in the oxygen deficient atmosphere. The electrical measurements were accompanied by AFM and SEM studies of structural properties, as well as by XPS analysis. It is established that changes of morphology and crystallinity of ITO films modify the low-temperature behavior of resistivity, which still remains typical for metallic transport. This is not the case for the oxygen deficient ITO layer. XPS analysis shows that grown in situ oxygen deficient ITO films have enhanced DOS between the Fermi level and the valence band edge. The extra localized states behave as acceptors leading to a compensation of n-type ITO. That can explain lower n-type conductivity in this material crossing over to a Mott-type hopping at low temperatures. Results for the low temperature measurements of stoichiometric ITO layers indicate that they do not show any trace of metal-to-insulator transition even at 4.2 K. We conclude that, although ITO is considered as a highly doped wide-band gap semiconductor, its low-temperature properties are very different from those of conventional highly doped semiconductors.

• Vestgården, Jørn Inge; Mikheenko, Pavlo; Galperin, Yuri & Johansen, Tom Henning (2013). Nonlocal electrodynamics of normal and superconducting films. New Journal of Physics. 15. doi: 10.1088/1367-2630/15/9/093001. Full text in Research Archive
• Johansen, Tom Henning; Pan, Alexey & Galperin, Yuri (2013). Exact asymptotic behavior of magnetic stripe domain arrays. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 87(6). doi: 10.1103/PhysRevB.87.060402. Full text in Research Archive
• Yurchenko, Vitaliy; Ilin, K; Meckbach, JM; Siegel, M; Qviller, Atle Jorstad & Galperin, Yuri [Show all 7 contributors for this article] (2013). Thermo-magnetic stability of superconducting films controlled by nanomorphology. Applied Physics Letters. ISSN 0003-6951. 102(25). doi: 10.1063/1.4812484. Full text in Research Archive
• Vestgården, Jørn Inge; Galperin, Yuri & Johansen, Tom Henning (2013). The Thermomagnetic Instability in Superconducting Films with Adjacent Metal Layer. Journal of Low Temperature Physics. ISSN 0022-2291. 173(5-6), p. 303–326. doi: 10.1007/s10909-013-0899-1. Full text in Research Archive
• Bergli, Joakim; Galperin, Yuri & Kopnin, N. B. (2013). Information flow and optimal protocol for a Maxwell-demon single-electron pump. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. ISSN 1539-3755. 88(6). doi: 10.1103/PhysRevE.88.062139. Full text in Research Archive
• Mikheenko, Pavlo; Qviller, Atle Jorstad; Vestgården, Jørn Inge; Chaudhuri, S.; Maasilta, IJ & Galperin, Yuri [Show all 7 contributors for this article] (2013). Nanosecond voltage pulses from dendritic flux avalanches in superconducting NbN films. Applied Physics Letters. ISSN 0003-6951. 102(2), p. 022601-1–022601-3. doi: 10.1063/1.4775693. Full text in Research Archive Show summary

  Combined voltage and magneto-optical study of magnetic flux flow in superconducting NbN films is reported. The nanosecond-scale voltage pulses appearing during thermomagnetic avalanches have been recorded in films partially coated by a metal layer. Simultaneous magneto-optical imaging and voltage measurements allowed the pulses to be associated with individual flux branches penetrating the superconductor below the metal coating. From detailed characteristics of pulse and flux branches, the electrical field in the superconductor is found to be in the range of 5-50 kV/m, while the propagation speed of the avalanche during its final stage is found to be close to 5 km/s. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.

• Stepina, N. P.; Koptev, E. S.; Pogosov, A. G.; Dvurechenskii, A. V.; Nikiforov, A. I. & Zhdanov, E. Y. [Show all 7 contributors for this article] (2013). Universal behavior of magnetoresistance in quantum dot arrays with different degrees of disorder. Journal of Physics: Condensed Matter. ISSN 0953-8984. 25(50). doi: 10.1088/0953-8984/25/50/505801. Full text in Research Archive
• Vestgården, Jørn Inge; Shantsev, Daniil; Galperin, Yuri & Johansen, Tom Henning (2013). The diversity of flux avalanche patterns in superconducting films. Superconductors Science and Technology. ISSN 0953-2048. 26(5). doi: 10.1088/0953-2048/26/5/055012. Full text in Research Archive
• Vestgården, Jørn Inge; Shantsev, Daniil; Galperin, Yuri & Johansen, Tom Henning (2012). Lightning in superconductors. Scientific Reports. 2, p. Art.Nr.–886. doi: 10.1038/srep00886. Full text in Research Archive
• Wold, Henry; Brox, Håkon; Galperin, Yuri & Bergli, Joakim (2012). Decoherence of a qubit due to either a quantum fluctuator, or classical telegraph noise. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 86(20). doi: 10.1103/PhysRevB.86.205404. Full text in Research Archive
• Brox, Håkon; Bergli, Joakim & Galperin, Yuri (2012). Bloch-sphere approach to correlated noise in coupled qubits. Journal of Physics A: Mathematical and Theoretical. ISSN 1751-8113. 45(45). doi: 10.1088/1751-8113/45/45/455302. Full text in Research Archive
• Drichko, IL; Diakonov, AM; Malysh, VA; Smirnov, IY; Koptev, ES & Nikiforov, AI [Show all 9 contributors for this article] (2012). Nonlinear high-frequency hopping conduction in two-dimensional arrays of Ge-in-Si quantum dots: Acoustic methods. Solid State Communications. ISSN 0038-1098. 152(10), p. 860–863. doi: 10.1016/j.ssc.2012.02.016. Full text in Research Archive
• Bergli, Joakim & Galperin, Yuri (2012). Logarithmic relaxation and stress aging in the electron glass. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 85(21). doi: 10.1103/PhysRevB.85.214202. Full text in Research Archive
• Brox, Håkon; Bergli, Joakim & Galperin, Yuri (2012). Importance of level statistics in the decoherence of a central spin due to a spin environment. Physical Review A. Atomic, Molecular, and Optical Physics (PRA). ISSN 1050-2947. 85(5). doi: 10.1103/PhysRevA.85.052117. Full text in Research Archive
• Bardalen, Eivind; Bergli, Joakim & Galperin, Yuri (2012). Coulomb glasses: A comparison between mean field and Monte Carlo results. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 85(15). doi: 10.1103/PhysRevB.85.155206. Full text in Research Archive
• Galperin, Yuri; Vestgården, Jørn Inge & Johansen, Tom Henning (2012). Dendritic flux avalanches in rectangular superconducting films - Numerical simulations. Physica. C, Superconductivity. ISSN 0921-4534. 479, p. 92–94. doi: 10.1016/j.physc.2011.12.019. Full text in Research Archive

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• Johansen, Tom Henning; Galperin, Yuri & Yurchenko, V. V. (2012). Complex Phenomena in Superconductors & Magnetic Systems. Complexphysics.org. ISBN 9788293224006. 70 p. Full text in Research Archive

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• Aleksandrov, EB; Andreev, AF; Galperin, Yuri; Gulyaev, YV; Zabrodskii, AG & Ivanov, SV [Show all 12 contributors for this article] (2022). In memory of Vadim L'vovich Gurevich. 65(2), p. 211–211. doi: 10.3367/UFNe.2022.01.039142. Full text in Research Archive
• Smirnov, I. Y.; Drichko, I. L.; Suslov, A. V.; Pfeiffer, L. N.; West, K. W. & Galperin, Yuri (2021). Effect of the strong electron correlations on the formation of Wigner crystal in n-GaAs/AlGaAs structure: Surface Acoustic Waves studies. Full text in Research Archive
• Galperin, Yuri (2019). Two-level fluctuators, 1/f noise and decoherence of qubits. Full text in Research Archive
• Galperin, Yuri; Bergli, Joakim & Sørdal, Vegard Børve (2018). Optimal protocols for a Maxwell Demon device with errors. Full text in Research Archive
• Colauto, Fabiano; Andrade, Adnei Melges H. De; Carmo, D.; Oliveira, Aria M.; Ortiz, Wilson Aires & Galperin, Yuri [Show all 7 contributors for this article] (2018). Field-induced anisotropy in Nb films with different thicknesses. Full text in Research Archive
• Galperin, Yuri (2017). Optimal protocols for a Maxwell Demon device. Full text in Research Archive
• Galperin, Yuri (2017). Non-equilibrium thermodynamics and fluctuations in small systems. Full text in Research Archive
• Andreev, A.F.; Buzdin, A.I.; Varlamov, A. A.; Vekilov, Y.K.; Galperin, Yuri & Dzyaloshinskii, I.E. [Show all 12 contributors for this article] (2017). In memory of Aleksei Alekseevich Abrikosov. 60(6), p. 638–639. doi: 10.3367/UFNe.2017.05.038129. Full text in Research Archive
• Johansen, Tom Henning; Galperin, Yuri; Baziljevich, Michail & Mikheenko, Pavlo (2017). Magneto-optical Imaging - How to See magnetism with your own eyes. Full text in Research Archive
• Suslov, A. V.; Drichko, I. L.; Smirnov, I. Y.; Pfeiffer, L. N.; West, K. W. & Galperin, Yuri (2016). Interaction of Surface Acoustic Waves with a 2D Wigner Crystal in High-Mobility n-GaAs/AlGaAs. Full text in Research Archive
• Suslov, A. V.; Drichko, I. L.; Smirnov, I. Y.; Pfeiffer, L. N.; West, K. W. & Galperin, Yuri (2016). Acoustic study of Wigner crystal melting in n-GaAs/AlGaAs at high magnetic fields. Full text in Research Archive
• Martinsen, Ørjan Grøttem; Abie, Sisay Mebre; Bergli, Joakim & Galperin, Yuri (2016). Universality of low frequency conductance of human hair. Proceedings of the 16th International Conference on Electrical Bioimpedance. p. 91–91. Full text in Research Archive
• Drichko, I. L.; Smirnov, I. Y.; Suslov, A V; Pfeiffer, L N; West, K W & Galperin, Yuri (2016). Surface acoustic waves as a probe of the Wigner crystal in n-GaAs/AlGaAs in vicinity of \nu=1/5, 1, and 2. Full text in Research Archive
• Drichko, I. L.; Smirnov, I. Y.; Suslov, A V; Pfeiffer, L N; West, K W & Galperin, Yuri (2016). Acoustic Study of Wigner Crystal Near Integer and Fractional Filling Factors in High-mobility n-GaAs/AlGaAs Heterostructure. Full text in Research Archive
• Drichko, I. L.; Smirnov, I. Y.; Suslov, A V; Pfeiffer, L N; West, K W & Galperin, Yuri (2016). Surface acoustic waves as a probe of the Wigner crystal in n-GaAs/AlGaAs in vicinity of \nu=1/5, 1, and 2. Bulletin of the American Physical Society. ISSN 0003-0503. 61(1), p. 732–732. Full text in Research Archive
• Bergli, Joakim; Galperin, Yuri; Martinsen, Ørjan Grøttem & Abie, Sisay Mebre (2016). Universality of AC conductance in human hair. Full text in Research Archive
• Galperin, Yuri (2016). High-frequency conductance of two-dimensional electron gas in the Quantum Hall regime. Full text in Research Archive
• Galperin, Yuri (2016). Oscillatory thermomagnetic instability in thin superconducting films. Full text in Research Archive
• Johansen, Tom Henning; Mikheenko, Pavlo; Maasilta, IJ; Chaudhuri, S. & Galperin, Yuri (2015). Snell's law behaviour of flux avalanche propagation in superconducting films. Full text in Research Archive
• Galperin, Yuri; Mikheenko, Pavlo; Johansen, Tom Henning; Chaudhuri, S. & Maasilta, IJ (2015). Ray optics behavior of flux avalanche propagation in superconducting films. Full text in Research Archive
• Suslov, A. V.; Drichko, I. L.; Smirnov, I. Y.; Pfeiffer, L; West, K. W' & Galperin, Yuri (2015). Study of Wigner Crystal in n-GaAs/AlGaAs by surface acoustic waves. Full text in Research Archive
• Mikheenko, Pavlo; Vestgården, Jørn Inge; Chaudhuri, S.; Maasilta, IJ; Galperin, Yuri & Cardwell, David A. [Show all 14 contributors for this article] (2015). Magneto-Optical Imaging: a tool for fundamental physics and applications of superconductivity. Full text in Research Archive
• Pekola, J. P.; Masuyama, Y.; Nakamura, Y.; Bergli, Joakim & Galperin, Yuri (2015). Dephasing and Dissipation in Qubit Thermodynamics. Full text in Research Archive
• Pekola, J. P.; Masuyama, Y.; Nakamura, Y.; Bergli, Joakim & Galperin, Yuri (2015). Dephasing and dissipation in qubit thermodynamics. Full text in Research Archive
• Galperin, Yuri; Johansen, Tom Henning & Vestgården, Jørn Inge (2014). Magnetic dendrites in superconductors. Full text in Research Archive
• Mikheenko, Pavlo; Vestgården, Jørn Inge; Chaudhuri, S.; Maasilta, IJ; Galperin, Yuri & Johansen, Tom Henning (2014). Complex flux flow in superconducting films. Full text in Research Archive
• Galperin, Yuri (2014). "Superconducting state: Mechanisms and properties" by V. Kresin et al. Physics Today. ISSN 0031-9228. 67(6), p. 50–51. Full text in Research Archive
• Galperin, Yuri (2014). Magnetic dendrites in superconductors. Full text in Research Archive
• Johansen, Tom Henning; Galperin, Yuri; Vestgården, Jørn Inge & Mikheenko, Pavlo (2013). Lightning in superconductors. Full text in Research Archive
• Mikheenko, Pavlo; Qviller, Atle Jorstad; Vestgården, Jørn Inge; Chaudhuri, S.; Maasilta, IJ & Galperin, Yuri [Show all 7 contributors for this article] (2013). Magnetic flux avalanches in superconducting films. Full text in Research Archive
• Martinsen, Ørjan Grøttem; Grimnes, Sverre; Bergli, Joakim & Galperin, Yuri (2013). Universality in the electrical conductance of human hair. Full text in Research Archive
• Bergli, Joakim & Galperin, Yuri (2013). Universal scaling form of AC response in variable range hopping. Full text in Research Archive
• Galperin, Yuri & Johansen, Tom Henning (2012). Avalanche penetration of magnetic flux into supercvonducting films. Full text in Research Archive
• Galperin, Yuri (2012). Dendritic magnetic flux avalanches in superconducting films. Full text in Research Archive
• Galperin, Yuri (2012). Low-frequency noise and slow relaxation in electron glasses: Minimal models for many-electron effects. Full text in Research Archive
• Galperin, Yuri (2012). Decoherence in quantum bits due to low-frequency noise. Full text in Research Archive
• Yurchenko, Vitaliy; Qviller, Atle Jorstad; Mikheenko, Pavlo; Galperin, Yuri & Johansen, Tom Henning (2012). Formation of quasi-1D clusters in vortex matter and their role in thermo-magnetic instability of superconductors. Full text in Research Archive
• Yurchenko, Vitaliy; Il'in, Konstantin; Mikheenko, Pavlo; Siegel, M; Galperin, Yuri & Johansen, Tom Henning (2012). Thermo-magnetic stability of NbN films with controlled nanogranularity. Full text in Research Archive

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