Transversal magnetoresistance in Weyl semimetals away from charge neutrality

TKM Institutsseminar

Speaker:

Janina Klier

Date:

13/07/2017 12:30

Where:

Room 10.01, 10th Floor, Bldg. 30.23, KIT Campus South

Affiliation:

Karlsruhe Institute of Technology

Host:

Prof. Dr. Alexander Mirlin

Abstract

We explore theoretically the magnetoresistance of Weyl semimetals in transversal magnetic fields away from charge neutrality. The analysis is done for two different models of disorder: (i) short-range impurties and (ii) charged (Coulomb) impurities. Within these two models of disorder, we calculate the conductivity away from charge neutrality point and the Hall conductivity. The unusual broadening of Landau levels leads to a non-monotonous magnetoresitance for both cases of disorder. Furthermore, it plays a crucial role for the magnetoresistance if chemical potential or the particle density is fixed. In the experimentally most relevant case of fixed particle density and Coulomb impurities, we find a large, linear magnetoresistance in a broad range of magnetic field including the quantum limit, while for fixed chemical potential and Coulomb impurities the linear magnetoresistance can only be observed in the very close vicinity of the charge neutrality point. Away from the quantum limit, we address Shubnikov-de Haas oscillations.