Dr. Erik Tellgren
Affiliation: Hylleraas Centre for Quantum Molecular Science, Department of Chemistry, University of Oslo
My recent research is mostly within three overlapping themes:
- Development of quantum-chemical methods, involving derivation of new numerical methods and implementation in software.
- Effects of magnetic fields on chemical bonding and molecular properties. Weak magnetic fields induce properties that are important for characterizing molecules. Strong magnetic fields can dramatically alter the physics and chemistry, and break symmetries, in ways that are largely unexplored to date.
- Mathematical aspects of quantum chemical methods, especially adaptations of density-functional theory that capture magnetic field effects. In this area rigorous mathematics (e.g. functional analysis) and pragmatic physical modelling intersect.
I did my master's thesis at Linköping University, Sweden, on relativistic effects on excited states in molecules. I then moved to the Department of Chemistry, UiO, and did my PhD on development of computational methods for periodic systems and magnetic effects. After that I have been a postdoc at Department of Chemistry, University of Tromsø, and back at the Department of Chemistry at UiO, where my work has been focused on magnetism. My research has pioneered the LONDON program, which was the first quantum-chemical software for molecules in strong magnetic fields.
My research has always involved a mix of physical/chemical modelling, numerical analysis, and programming. In recent years I've also expanded my research interests to mathematical aspects of the underlying methods. In 2015-2019 I led an independent project on symmetry breaking due to magnetic fields. Presently I a researcher within the Hylleraas Centre for Quantum Molecular Science.
Supervisor for the following CompSci project
- Development of density-functional methods utilizing tensor densities (available in call 2)