Superconductivity in Few-Layer Stanene

Abstract

A single atomic slice of α-tin-stanene-has been predicted to host quantum spin Hall effect at room temperature, offering an ideal platform to study low-dimensional and topological physics. While recent research has intensively 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 unexpectedly discover superconductivity in few-layer stanene down to a bilayer grown on PbTe, while bulk α-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 angle resolved photoemission spectroscopy (ARPES) together with first-principles calculations elucidate the corresponding band structure. Interestingly, the theory also indicates the existence of a topologically nontrivial band. Our experimental findings open up novel strategies for constructing two-dimensional topological superconductors.

arXiv comment17 pages, 10 figures

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• Stacking-configuration-enriched essential properties in bilayer silicenes
• Decagonal Sn clathrate on $d$-Al-Ni-Co
• A theory of coupled dual dynamics of macroscopic phase coherence and microscopic electronic fluids: effect of dephasing on cuprate superconductivity
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• Influence of nano-hole defects and their geometric arrangements on the superfluid density in atomically thin single crystals of indium superconductor
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• Growth of bilayer stanene on a magnetic topological insulator aided by a buffer layer
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• Stable Thin Clathrate Layers