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

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

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 t...

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Bibliographic Details
Main Authors: 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
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: American Physical Society 2017
Online Access:http://hdl.handle.net/1721.1/107485
https://orcid.org/0000-0002-8803-1017
Description
Summary: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).

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