Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 59: Topological Insulators II (jointly with DS, HL, O, TT)
MA 59.3: Vortrag
Freitag, 24. März 2017, 10:00–10:15, HSZ 04
Chiral anomaly and negative longitudinal magnetoresistance in Weyl semimetals within a Boltzmann approach — •Annika Johansson1,2, Julia Weiner2, Jürgen Henk2, and Ingrid Mertig2,1 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Martin Luther University Halle-Wittenberg, Halle, Germany
In Weyl semimetals, the application of non-orthogonal electric and magnetic fields gives rise to the chiral anomaly. The breaking of the chiral symmetry results in nonconservation of chiral charge [1-3]. Phenomena related to the chiral anomaly are the anomalous Hall effect, the chiral magnetic effect, and the negative longitudinal magnetoresistance (NLMR).
We consider the chiral anomaly in Weyl semimetals for small magnetic fields [4]. Using a semiclassical Boltzmann approach, we investigate the increase of the longitudinal charge conductivity related to the chiral anomaly. The longitudinal magnetoresistance is calculated for model systems including anisotropic and energy dependent momentum relaxation times. The energy dependence of the scattering processes has a pronounced effect on the magnitude of the NLMR, whereas the influence of the relaxation time anisotropy is negligible.
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[4] D. T. Son and B. Z. Spivak, Phys. Rev. B 88, 104412 (2013)