SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Poster Session: Topology

TT 25.10: Poster

Thursday, September 30, 2021, 13:30–16:00, P

Weyl systems: anomalous transport normally explained — •Klaus Morawetz — Münster University of Applied Sciences,Stegerwaldstrasse 39, 48565 Steinfurt, Germany — International Institute of Physics- UFRN,Campus Universitário Lagoa nova,59078-970 Natal, Brazil

The anomalous term ∼E^→B^→ in the balance of the chiral density can be rewritten as quantum current in the classical balance of density. This term is derived from the quantum kinetic equations for systems with SU(2) structure within a completely conserving approach and it is suggested that the term is of kinetic origin instead of anomaly. Regularization-free density and pseudospin currents are calculated in Graphene and Weyl-systems realized as the infinite-mass limit of electrons with quadratic dispersion and a proper spin-orbit coupling. The intraband and interband conductivities are discussed. The optical conductivity agrees well with the experimental values using screened impurity scattering and an effective Zeeman field. The universal value of Hall conductivity is shown to be modified due to the Zeeman field.
[1] Eur. Phys. J. B 92 (2019) 176
Phys. Lett. A 383 (2019) 1362
[2] Phys. Rev. B 94 (2016) 165415
[3] Phys. Rev. B 92 (2015) 245425
[4] errata: Phys. Rev. B93 (2016) 239904(E)
[5] Phys. Rev. B 92 (2015) 245426