audunska

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Academic interests

I am interested in the statistical behavior of topological defects in different kinds of non-equilibrium systems. Examples of topological defects I have studied are quantized vortices in Bose-Einstein condensates, and crystal defects in crystals undergoing deformation. In both these systems the dynamics of the entire system is dominated by the dynamics of defects, so the statistics of the defects can tell you a lot about how the system behaves on a macroscopic scale. 

Courses taught

Background

Master's degree in Physics, University of Oslo. I studied a long chain of interacting spin 1/2 particles, e.g. a 1D quantum Heisenberg model in a constant magnetic field. Previous work had shown that this system should contain natural oscillation frequencies due to an analogy with Bloch oscillations, called magnetic Bloch oscillations. I used a new technique called Time Evolving Block Decimation (TEBD) in order to simulate the full chain without uncontrolled approximations. I found that we could excite the predicted oscillation frequencies using a resonant laser, resulting in characteristic oscillations in the magnetization.

Thesis: https://www.duo.uio.no/handle/10852/38773

Publications

  • Skogvoll, Vidar; Skaugen, Audun & Angheluta, Luiza (2021). Stress in ordered systems: Ginzburg-Landau-type density field theory. Physical review B (PRB). ISSN 2469-9950. 103(22). doi: 10.1103/PhysRevB.103.224107.
  • Skogvoll, Vidar; Skaugen, Audun; Angheluta, Luiza & Viñals, Jorge (2021). Dislocation nucleation in the phase-field crystal model. Physical review B (PRB). ISSN 2469-9950. 103(1), p. 014107-1–014107-8. doi: 10.1103/PhysRevB.103.014107.
  • Rønning, Jonas; Skaugen, Audun; Hernández-García, Emilio; López, Cristóbal & Angheluta, Luiza (2020). Classical analogies for the force acting on an impurity in a Bose-Einstein condensate. New Journal of Physics. ISSN 1367-2630. 22. doi: 10.1088/1367-2630/ab95de. Full text in Research Archive
  • Skaugen, Audun; Angheluta, Luiza & Vinals, Jorge (2018). Separation of Elastic and Plastic Timescales in a Phase Field Crystal Model. Physical Review Letters. ISSN 0031-9007. 121(25), p. 255501-01–255501-05. doi: 10.1103/PhysRevLett.121.255501. Full text in Research Archive
  • Skaugen, Audun; Angheluta, Luiza & Vinals, Jorge (2018). Dislocation dynamics and crystal plasticity in the phase-field crystal model. Physical review B (PRB). ISSN 2469-9950. 97(5). doi: 10.1103/PhysRevB.97.054113. Full text in Research Archive
  • Skaugen, Audun & Angheluta, Luiza (2017). Origin of the inverse energy cascade in two-dimensional quantum turbulence. Physical review. E. ISSN 2470-0045. 95(5). doi: 10.1103/PhysRevE.95.052144. Full text in Research Archive
  • Skaugen, Audun & Angheluta, Luiza (2016). Vortex clustering and universal scaling laws in two-dimensional quantum turbulence. Physical review. E. ISSN 2470-0045. 93(3). doi: 10.1103/PhysRevE.93.032106.
  • Skaugen, Audun & Angheluta, Luiza (2016). Velocity statistics for nonuniform configurations of point vortices. Physical review. E. ISSN 2470-0045. 93(4). doi: 10.1103/PhysRevE.93.042137.

View all works in Cristin

  • Skaugen, Audun (2018). A unified perspective on two-dimensional quantum turbulence and plasticity. Det matematisk-naturvitenskapelige fakultet. Full text in Research Archive

View all works in Cristin

Published Oct. 9, 2014 12:27 PM - Last modified Oct. 26, 2017 3:12 PM