Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Spintronics (other effects) (joint session MA/TT)

TT 60.8: Vortrag

Mittwoch, 11. März 2026, 17:15–17:30, POT/0112

Theoretical description of the optical activity and directional dichroism of chiral solids — •Hubert Ebert and Sergiy Mankovsky — Ludwig Maximilian University of Munich, Munich, DE

A scheme to deal with the optical activity and directional dichroism of solids on the basis of Kubo’s linear response formalism is presented. Accounting for the q^→-dependence of the radiation field implies that the corresponding optical transitions described in k^→-space are no more vertical. More important, one is led to corrections to the electric dipole matrix element due to the electric quadrupole and magnetic dipole interaction. The scheme is implemented making use of the relativistic Korringa-Kohn-Rostoker Green function (KKR-GF) formalism. Corresponding applications to chiral Te that has time reversal (T) but no inversion (I) symmetry led to a q^→-dependent optical conductivity tensor with off-diagonal elements caused by the interference of the electric dipole and its correction terms giving rise to optical activity. In the case of anti-ferromagnetic Cr₂O₃ without T-symmetry the correction terms lead to directional dichroism that strongly depends on whether a magnetic configuration with or without I- but with combined IT-symmtetry is considered.

Keywords: optical activity; directional dichroism; Kubo's linear response; DFT calculation; chiral materials