Regensburg 2019 – scientific programme
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O: Fachverband Oberflächenphysik
O 62: Poster Wednesday: Topology and Symmetry-Protected Materials
O 62.6: Poster
Wednesday, April 3, 2019, 17:45–20:00, Poster B1
Surface Berry curvature dipole in topological materials — •Dennis Wawrzik1, Jhih-Shih You1, Inti Sodemann2, and Jeroen van den Brink1,3 — 1Institute for Theoretical Physics, IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2Max Planck Institute for the Physics of Complex Systems, Nöthnitzerstr. 38, 01187 Dresden, Germany — 3Department of Physics, Technical University Dresden, Helmholtzstr. 10, 01062 Dresden, Germany
Recently the research on understanding the effects of quantum geometry in novel materials has attracted considerable attentions both in theory and in experiment. A remarkable example is the Hall-like current that can occur in second-order response to an external electric field in materials with time-reversal symmetry but broken inversion symmetry, as a result of the dipole moment of the Berry curvature (BCD). However, the BCD is not allowed if a bulk has high crystalline symmetries. We show that for a proper chosen surface breaking some of these bulk symmetries one can find a non-vanishing surface BCD. The proposed effect could be observed in topological materials with a conducting surface like Weyl semimetals and TCIs.