Journal
FRONTIERS OF PHYSICS
Volume 13, Issue 3, Pages -Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11467-018-0757-3
Keywords
scanning tunneling microscope; antimonene; density functional theory
Categories
Funding
- National Key R&D Program of China [2016YFA0200603, 2017YFA0205004]
- Strategic Priority Research Program of CAS [XDB01020100]
- National Natural Science Foundation of China [91321309, 21421063, 21473174]
- Fundamental Research Funds for the Central Universities [WK2060190027, WK 2060190084]
- Youth Innovation Promotion Association of CAS [2011322]
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The synthesis of antimonene, which is a promising group-V 2D material for both fundamental studies and technological applications, remains highly challenging. Thus far, it has been synthesized only by exfoliation or growth on a few substrates. In this study, we show that thin layers of antimonene can be grown on Ag(111) by molecular beam epitaxy. High-resolution scanning tunneling microscopy combined with theoretical calculations revealed that the submonolayer Sb deposited on a Ag(111) surface forms a layer of AgSb2 surface alloy upon annealing. Further deposition of Sb on the AgSb2 surface alloy causes an epitaxial layer of Sb to form, which is identified as antimonene with a buckled honeycomb structure. More interestingly, the lattice constant of the epitaxial antimonene (5 A) is much larger than that of freestanding antimonene, indicating a high tensile strain of more than 20%. This kind of large strain is expected to make the antimonene a highly promising candidate for roomtemperature quantum spin Hall material.
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