Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.046802
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Funding
- JSPS (KAKENHI) [25220707, 26800165, 15K17675]
- National Natural Science Foundation of China [11674371, 11474340, 11234014, 11274359, 11422428, 51671193]
- Ministry of Science and Technology of China [2013CB921700, 2015CB921300, 2016YFA0300600, 2016YFA0401000]
- Chinese Academy of Sciences [XDB07000000]
- Photon and Quantum Basic Research Coordinated Development Program from MEXT
- Grants-in-Aid for Scientific Research [26800165, 15K17675] Funding Source: KAKEN
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We discover a pair of spin-polarized surface bands on the (111) face of grey arsenic by using angleresolved photoemission spectroscopy (ARPES). In the occupied side, the pair resembles typical nearlyfree- 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 (Gamma) over bar G 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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