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TT: Fachverband Tiefe Temperaturen

TT 65: Poster Session Topological Topics

TT 65.11: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Dynamical density and spin response of Fermi arcs and their consequences for Weyl semimetals — •Sayandip Ghosh¹ and Carsten Timm² — ¹Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, 16163 Genova, Italy — ²Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany

Weyl semimetals exhibit exotic Fermi-arc surface states, which strongly affect their electromagnetic properties. We derive analytical expressions for all components of the composite density-spin response tensor for the surfaces states of a minimal Weyl-semimetal model. Based on the results, we discuss the electromagnetic susceptibilities, the current response, and other physical effects arising from the density-spin response. We find a magnetoelectric effect caused solely by the Fermi arcs. We also discuss the effect of electron-electron interactions within the random phase approximation and investigate the dispersion of plasmon excitations formed by Fermi-arc states. Our work is useful for understanding the electromagnetic and optical properties of the Fermi arcs.