SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Topology: Other Topics
TT 64.2: Vortrag
Freitag, 31. März 2023, 09:45–10:00, HSZ 201
Electronic correlations and pseudo Fermi arcs due to geometry of the Fermi surface in semimetals — •Elena Derunova — IFW, Helmholz str.20, Dresden
Moving forward from topological theory I present a geometrical approach to analyze the bandstructures and Fermi surfaces. Particularly, the effect of hyperbolic geometry of the Fermi surface on the Fermi liquid breakdown and correlated transport effects will be presented. As a mechanism for realizing these correlations, I introduce pseudo Fermi arcs connecting separate pockets of hyperbolic Fermi surface. A breakdown of time-reversal symmetry via tunneling through those pseudo arcs is referred as Fermi Surface Geometry Effect (FS-GE). The predictable power of FS-GE is tested on the spin and anomalous Hall effects, traditionally associated with intrinsic time-reversal symmetry breaking. An index, HF, quantifying FS-GE in a particular direction, shows a universal correlation (R2 = 0.97) with the experimentally measured intrinsic anomalous Hall conductivity in that direction, of 16 different compounds spanning a wide variety of crystal, chemical, and electronic structure families, where the topological methods give just R2 = 0.52. This raises a question about the principal limits of topological physics, dominating now the predictions of non-trivial electron transport, and its transformation into a wider study of bandstructures’ and Fermi surfaces’ geometries, opening a horizon for the prediction of phenomena beyond topological understanding.