Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Topology: Poster
TT 35.4: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P3
Planar Hall and Anomalous Planar Hall Effects up to Room Temperature in t-PtBi2 — •Ankit Kumar — IFW Dresden
In topological semimetals, Hall measurements provide an important charge transport footprint of the non-trivial geometric properties of the electronic wavefunctions. In Weyl semimetals, the planar Hall effect (PHE) – the appearance of a transverse voltage when coplanar electric and magnetic fields are applied – is a direct consequence of the longitudinal linear magnetoconductance associated with the chiral anomaly of Weyl fermions, and is quantified by the large Berry curvature of Weyl nodes. The anomalous Hall effect is fully determined only by the location in the Brillouin zone and topological charge of the Weyl nodes. Time-reversal invariance prohibits any anomalous Hall signal in the large class of non-magnetic Weyl semimetals thereby leaving the PHE as the only Hall diagnostic tool of Weyl physics, at least in the linear regime. This complicates the identification of non-magnetic topological semimetals by charge transport experiments.
Keywords: Weyl semimetals; Anomalous planar Hall effect; 3 D Hall effect; Anomalous planar Nernst effect; Topological superconductivity