Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Topological Semimetals - Theory (joint session TT/MA)

TT 37.3: Vortrag

Mittwoch, 3. April 2019, 10:00–10:15, H22

Chiral anomaly in Weyl semimetals within a Fermi surface harmonics approach — •Annika Johansson1,2, Jürgen Henk2, and Ingrid Mertig2,11Max Planck Institute of Microstructure Physics, Halle, Germany — 2Martin Luther University Halle-Wittenberg, Halle, Germany

In Weyl semimetals, external nonorthogonal magnetic and electric fields lead to nonconservation of the chiral charge, known as chiral anomaly [1-4]. This quantum phenomenon manifests itself in a negative longitudinal magnetoresistance. Using a Fermi surface harmonics approach [5] for solving the semiclassical Boltzmann equation, we calculate transport properties of type-I Weyl semimetals, including influences of chiral anomaly, Lorentz force as well as momentum-dependent scattering. Respecting a modified phase-space volume, we identify additional contributions to the chiral charge conductivity which can change the sign of the magnetoresistance in systems with broken inversion symmetry. Considering momentum-dependent scattering modifies the energy-dependence of the transport properties. On top of this, we show for TaAs that a misalignment of an applied magnetic field with the crystal axes can destroy the negative longitudinal magnetoresistance.
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