Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 122: Topology and Symmetry Protected Materials II
O 122.6: Talk
Friday, March 20, 2020, 11:45–12:00, WIL A317
Fermi arc transport in nanowires of Dirac and Weyl semimetals — •Pavlo Sukhachov1, Mykhailo Rakov2, Olena Teslyk3, and Eduard Gorbar3,4 — 1Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden — 2Institut für Mathematische Physik, Technische Universität Braunschweig, Mendelssohnstraße 3, 38106 Braunschweig, Germany — 3Faculty of Physics, Kyiv National Taras Shevchenko University, 64/13 Volodymyrska st., 01601 Kyiv, Ukraine — 4Bogolyubov Institute for Theoretical Physics, 03680 Kyiv, Ukraine
The electron states and transport properties in cylinder nanowires of topological Dirac and Weyl semimetals are investigated. The presence of the Fermi arc surface states makes the electric charge and current density distributions in nanowires strongly nonuniform. By using the Kubo linear response approach, both direct and alternating current conductivities are calculated and it is found that their spatial profiles are nontrivial. By explicitly separating the contributions of the surface and bulk states, it is shown that when the electric chemical potential is small, the conductivity is determined primarily by the Fermi arcs and is much higher at the surface than in the bulk of the wire. Due to the rise of the surface-bulk transition rate, the relative contribution of the surface states to the total conductivity gradually diminishes with the increase of the chemical potential and the frequency. A nontrivial spatial profile of the conductivity in the case of the alternating current response might allow for a novel Fermi arc skin effect, where the localization is significantly enhanced.