Epitaxial growth of highly strained antimonene on Ag(111) |
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Authors: | Ya-Hui Mao Li-Fu Zhang Hui-Li Wang Huan Shan Xiao-Fang Zhai Zhen-Peng Hu Ai-Di Zhao Bing Wang |
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Affiliation: | 1. Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China2. School of Physics, Nankai University, Tianjin 300071, China3. These authors contributed equally to this work. |
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Abstract: | 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 Å) 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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Keywords: | scanning tunneling microscope antimonene density functional theory |
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