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Topologically Entangled Rashba-Split Shockley States on the Surface of Grey Arsenic

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.; Fang, Z.; Chen, X.-Q.; Qian, T.; Ding, H.; Shin, S.; Fu, Liang; ... Show more Show less
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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).
Date issued
2017-01
URI
http://hdl.handle.net/1721.1/107485
Department
Massachusetts Institute of Technology. Department of Physics
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
ISSN
0031-9007
1079-7114

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