Berlin 2015 – wissenschaftliches Programm
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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 Klier1,2, Igor Gornyi1,3, and Alexander Mirlin1,2,4 — 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.