Journal
NATURE PHYSICS
Volume 14, Issue 4, Pages 344-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41567-017-0031-6
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Funding
- Ministry of Science and Technology of China [2017YFA0304600, 2017YFA0302902]
- National Natural Science Foundation of China [11604176]
- Beijing Advanced Innovation Center for Future Chip (ICFC)
- Tsinghua University Initiative Scientific Research Program
- National Thousand-Young-Talents Program
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
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A single atomic slice of alpha-tin-stanene-has been predicted to host the quantum spin Hall effect at room temperature, offering an ideal platform to study low-dimensional and topological physics. Although recent research has focused on monolayer stanene, the quantum size effect in few-layer stanene could profoundly change material properties, but remains unexplored. By exploring the layer degree of freedom, we discover superconductivity in few-layer stanene down to a bilayer grown on PbTe, while bulk alpha-tin is not superconductive. Through substrate engineering, we further realize a transition from a single-band to a two-band superconductor with a doubling of the transition temperature. In situ angleresolved photoemission spectroscopy (ARPES) together with first-principles calculations elucidate the corresponding band structure. The theory also indicates the existence of a topologically non-trivial band. Our experimental findings open up novel strategies for constructing two-dimensional topological superconductors.
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