Detta är en digital seminarieserie i kondenserade materiens fysik och atomfysik, med syfte att koppla samman forskare från olika nordiska universitet. Samtalen är informella och ska inspirera till diskussioner och interaktioner.
Morten Holm Christensen (Niels Bohr Institute Copenhagen)
Odd-parity magnetism constitutes an intriguing phase of matter which breaks inversion symmetry while preserving time-reversal symmetry. I will discuss the crystallographic symmetry requirements behind the formation of such a phase and show a few of its more peculiar consequences. Then, I will introduce the Fe-based superconductors and demonstrate that these constitute odd-parity magnets in a certain doping region, where the magnetic order is coplanar. These results are based on both low-energy and first-principles modelling of the Fe-based materials which allows us to understand the underlying microscopic parameters controlling the odd-parity magnetism and make material-specific predictions for the magnitude of the derived effects. I will go through the low-energy model in some detail and discuss the impact of atomic spin-orbit coupling on the odd-parity magnetism.
Zoom-länk: https://nordita.org/zoom/nvcms