Topologically Entangled Rashba-Split Shockley States on the Surface of Grey Arsenic
Name
PhysRevLett.118.046802.pdf
Size
2.29 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Zhang, Peng
Ma, J.-Z.
Ishida, Y.
Zhao, L.-X.
Xu, Q.-N.
Lv, B.-Q.
Yaji, K.
Chen, G.-F.
Weng, H.-M.
Dai, X.
Date Issued
January 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Zhang, Peng et al. “Topologically Entangled Rashba-Split Shockley States on the Surface of Grey Arsenic.” Physical Review Letters 118.4 (2017): n. pag. © 2017 American Physical Society
Version
Final published version
Abstract
We discover a pair of spin-polarized surface bands on the (111) face of grey arsenic by using angle-resolved photoemission spectroscopy (ARPES). In the occupied side, the pair resembles typical nearly-free-electron Shockley states observed on noble-metal surfaces. However, pump-probe ARPES reveals that the spin-polarized pair traverses the bulk band gap and that the crossing of the pair at Γ[over ¯] is topologically unavoidable. First-principles calculations well reproduce the bands and their nontrivial topology; the calculations also support that the surface states are of Shockley type because they arise from a band inversion caused by crystal field. The results provide compelling evidence that topological Shockley states are realized on As(111).
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.118.046802
