Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.016801
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Funding
- National Basic Research Program of China [2012CB927401, 2011CB921902, 2011CB922200]
- NSFC [10928408, 10874116, 10904090, 11174199, 11134008]
- SSTCC [10QA1403300, 10JC1407100, 10PJ1405700, 11PJ405200]
- Project of Knowledge Innovation Program (PKIP) of Chinese Academy of Sciences [KJCX2.YW.W10]
- Shu Guang project
- Shanghai Municipal Education Commission
- Shanghai Education Development Foundation
- Program for Professor of Special Appointment at Shanghai Institutions of Higher Learning
- US DOE-BES [DE-FG02-04ER46148]
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By combining scanning tunneling microscopy and spectroscopy, angle-resolved photoemission spectroscopy, and density functional theory band calculations, we directly observe and resolve the onedimensional edge states of single bilayer (BL) Bi(111) islands on clean Bi2Te3 and Bi(111)-covered Bi2Te3 substrates. The edge states are localized in the vicinity of step edges having an similar to 2 nm wide spatial distribution in real space and reside in the energy gap of the Bi(111) BL. Our results demonstrate the existence of nontrivial topological edge states of single Bi(111) bilayer as a two-dimensional topological insulator.
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