Berlin 2024 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 24: Transport in Materials: Diffusion, Conduction of Charge or Heat II
MM 24.3: Vortrag
Dienstag, 19. März 2024, 12:15–12:30, C 264
Chiral anomaly induced monopole current and nonlinear circular dichroism — •Nikolai Peshcherenko1, Claudia Felser1, and Yang Zhang2 — 1Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany — 2University of Tennessee, Knoxville, Tennessee 37996, USA
Topological Weyl and Dirac semimetals are known to demonstrate a chiral anomaly effect subject to parallel electric and magnetic fields. The most well-known experimental probe of this effect is large negative longitudinal magnetoresistance. However, due to other strongly non-isotropic contributions to magnetoresistance existing in semimetals it could be interesting to consider other possible types of chiral anomaly experimental manifestations.
We suggest a simple chirality probe in TR invariant Weyl and Dirac semimetals with nonlinear Hall response. We demonstrate that chiral anomaly-induced relative shift of Weyl cones in energy space gives rise to chirality-asymmetric intranode momentum relaxation times. Due to this asymmetry, proportional to anomalous velocity Hall currents excited by external electric fields in different Weyl nodes do not perfectly compensate each other. We predict that this effect could be also observed in circular dichroism measurements.
Keywords: Topological materials; Chiral anomaly; Nonlinear Hall response; Circular dichroism; Berry curvature monopoles