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HL: Fachverband Halbleiterphysik

HL 8: Transport: Spintronics and magnetotransport (TT with HL)

HL 8.6: Vortrag

Montag, 16. März 2015, 11:00–11:15, A 053

Magnetoresistance in Weyl semimetals — •Janina Klier^1,2, Igor Gornyi^1,3, and Alexander Mirlin^1,2,4 — ¹Institute for Nanotechnology, Karlsruher Institute for Technology, Karlsruhe, Germany — ²Institute for Theoretical Condensed Matter physics, Karlsruher Institute for Technology, Karlsruhe, Geermany — ³A.F. Ioffe Physico-Technical Institute, St. Petersburg, Russia — ⁴Petersburg Nuclear Physics Institute, St. Petersburg, Russia

We theoretically study the magnetoresistvity of a Weyl semimetal within two disorder models: pointlike impurities and charged impurities. Impurity scattering is treated using a self-consistent Born approximation. We find an unusual broadening of Landau levels which leads to a rich structure of various regimes in temperature-magnetic field plane. In particular, the magnetoresitance shows non-monotonous behavior. In the limits of strongest magnetic fields for pointlike impurities, this leads to a vanishing magnetoresistance. For charged impurities, broadening of Landau levels is less important in high magnetic fields. This leads to a positive linear magnetoresistance in strongest magnetic fields.