Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session W60: Weyl Semimetal, Transport II
8:00 AM–10:36 AM,
Friday, March 6, 2020
Room: Mile High Ballroom 4A
Sponsoring
Unit:
DMP
Abstract: W60.00004 : Interplay of Dirac Nodes and Volkov-Pankratov Surface States in Compressively Strained HgTe
Presenter:
David Mahler
(University of Wurzburg)
Authors:
David Mahler
(University of Wurzburg)
Julian-Benedikt Mayer
(University of Wurzburg)
Philipp Leubner
(University of Wurzburg)
Lukas Lunczer
(University of Wurzburg)
Domenico Di Sante
(University of Wurzburg)
Giorgio Sangiovanni
(University of Wurzburg)
Ronny Thomale
(University of Wurzburg)
Ewelina M Hankiewicz
(University of Wurzburg)
Hartmut Buhmann
(University of Wurzburg)
Charles Gould
(University of Wurzburg)
Laurens W Molenkamp
(University of Wurzburg)
We can clearly disentangle surface and bulk contributions by using gate voltage to tune the Fermi energy precisely to the Weyl/Dirac nodes and thus convincingly identify the chiral anomaly. We find no evedince for Fermi-arcs, but topological surface states, that are responsible for the transport in the electron regime. These states are created by the same band inversion leading to the formation of the Dirac/Weyl nodes, and therefore must always be present. Additionally, in the hole regime surface states induced by the electric field, so called massive Volkov-Pankratov states [2, 3], are observed.
[1] D. M. Mahler, et al. Phys. Rev. X 9, 031034 (2019)
[2] B. A. Volkov and O. A. Pankratov, JETP Lett. 42, 4 (1985)
[3] A. Inhofer, et al. PRB 96, 195104 (2017)
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