Journal
PHYSICAL REVIEW B
Volume 85, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.081305
Keywords
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Funding
- Department of Energy [DE-SC0002623]
- CMSN
- National Science Foundation
- Ministry of Science and Technology of China
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Magnetic impurities are crucial for probing spin-polarized topological surface states. Scanning tunneling microscopy (STM) studies of Fe on the Bi2Te3(111) surface are preformed and unveil distinct impurity structures of unknown origin which exhibit temperature-dependent characteristics. Using density functional theory with spin-orbit coupling, we show that Fe prefers highly coordinated subsurface configurations. By comparing simulated STM images we can explain the experimental results of both low-temperature deposition, in which Fe exists in metastable states of which only the transition-metal Bi split interstitial is STM visible, and after room-temperature annealing, in which iron forms substitutional Fe-Bi.
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