Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Topological Semimetals 1

TT 21.6: Vortrag

Dienstag, 17. März 2020, 10:45–11:00, HSZ 103

Surface Berry curvature dipole of Weyl semimetals — •Dennis Wawrzik1, Jhih-Shih You1, Inti Sodemann2, and Jeroen van den Brink1,31Institute for Theoretical Solid State Physics, IFW Dresden, Germany — 2Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 3Department of Physics, TU Dresden, Germany

In the absence of magnetic field, the Hall effect in the linear response regime vanishes due to time-reversal symmetry. However, a transverse charge current can still occur in second-order response to an external electric field, as a result of the Berry curvature dipole (BCD) in momentum space. While there has been much effort to understand nonlinear transport due to a BCD in bulk, here we show that for Weyl semimetals the surface Fermi arcs of a proper chosen surface give rise to a giant BCD. In particular, the surface BCD scales with the sample size. In our study, we employ a general k-dot-p model which covers a wide class of type-I Weyl materials.

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