Combining quantum spin hall effect and superconductivity in few-layer stanene

Abstract

Stanene was proposed to be a quantum spin hall insulator containing topological edges states and a time reversal invariant topological superconductor hosting helical Majorana edge mode. Recently, experimental evidences of existence of topological edge states have been found in monolayer stanene films and superconductivity has been observed in few-layer stanene films excluding single layer. An integrated system with both topological edge states and superconductivity are higly pursued as a possible platform to realize topological superconductivity. Few-layer stanene show great potential to meet this requirement and is highly desired in experiment. Here we successfully grow few-layer stanene on bismuth (111) substrate. Both topological edge states and superconducting gaps are observed by in-situ scanning tunneling microscopy/spectroscopy (STM/STS). Our results take a further step towards topological superconductivity by stanene films.

14 pages,4 figures

References in corpus (16)

• Topological Insulators
• Topological insulators and superconductors
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• A generic new platform for topological quantum computation using semiconductor heterostructures
• Epitaxial Growth of Two-Dimensional Stanene
• Non-Abelian statistics and topological quantum information processing in 1D wire networks
• Majorana Fermions in Equilibrium and Driven Cold Atom Quantum Wires
• Evidence for Majorana bound state in an iron-based superconductor
• Topological Superconductivity and Superfluidity
• Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure
• Large-Gap Quantum Spin Hall States in Stanene Grown on Substrate
• Gapped Electronic Structure of Epitaxial Stanene on InSb(111)
• Type-II Ising superconductivity in two-dimensional materials with strong spin-orbit coupling
• Symmetry-protected non-Abelian braiding of Majorana Kramers' pairs