Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D23: Advances in Probing and Designing Topological Materials: Theory and Experiment
3:00 PM–6:00 PM,
Monday, March 6, 2023
Room: Room 215
Sponsoring
Unit:
DCMP
Chair: Clifford Hicks, University of Birmingham
Abstract: D23.00008 : Surface states in HgTe and α-Sn semimetals in various topological regimes*
4:24 PM–4:36 PM
Presenter:
Alexander Khaetskii
(AFRL)
Authors:
Alexander Khaetskii
(AFRL)
Vitaly Golovach
(DIPC, Spain)
Arnold Kiefer
(AFRL)
We consider biaxial in-plane strain that is either tensile or compressive, leading to different branches of surface states for topological insulators (TIs) and Dirac semimetals (DSMs), respectively. We show that in TI regime strain is a smooth deformation to the surface states not leading to any drastic change of the physical properties in these materials, in contrast to what has recently been advanced in the literature. In DSM regime, however, strain strongly changes the surface state spectrum.
We have also investigated the surface states in HgTe material under an in-plane compressive strain and taking into account a bulk inversion asymmetry, which leads to a nodal-line-semimetal regime. Again, these results are qualitatively different from the ones previously published.
Our results can help in interpreting numerous experiments on topological surface states originating from inverted-band semiconductors.
*This work is supported by the AFOSR (FA9550-AFOSR-20RYCOR039). A.Kh. received support via an NRC Research Associateship award.
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