Superconductivity of Few-Layer Stanene Grown on Topological Insulators

Stanene is a promising candidate for quantum spin Hall (QSH) insulator and topological superconductor (TSC) [1]. The superconductivity of few-layer stanene has been confirmed by transport measurements [2, 3] and scanning tunnelling microscopy/spectroscopy (STM/STS) [4]. Recently, we successfully obtain the superconducting few-layer stanene grown directly on topological insulator (TI) substrates. The substrate is kept at a low temperature during Sn depositing to prevent reaction between Sn and TIs and to avoid possible interdiffusion [5]. Our electrical transport measurements unveil the consecutively tuned superconductivity by changing the substrate type and thickness of stanene and TI layers.