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Two-dimensional stanene is a promising candidate material for realizingroom-temperature quantum spin Hall (QSH) effect. Monolayer stanene has recentlybeen fabricated by molecular beam epitaxy, but shows metallic features onBi$_2$Te$_3$(111) substrate, which motivates us to study the importantinfluence of substrate. Based on first-principles calculations, we find thatvarying substrate conditions considerably tunes electronic properties ofstanene. The supported stanene gives either trivial or QSH states, withsignificant Rashba splitting induced by inversion asymmetry. More importantly,large-gap (up to 0.3 eV) QSH states are realizable when growing stanene onvarious substrates, like the anion-terminated (111) surfaces of SrTe, PbTe,BaSe and BaTe. These findings provide significant guidance for future researchof stanene and large-gap QSH states.

Large-Gap Quantum Spin Hall States in Stanene Grown on Substrate