Revealing surface states in In-doped SnTe superconducting nanoplates with low bulk mobility

Abstract

Indium (In) doping in topological crystalline insulator SnTe induces superconductivity, making In-doped SnTe a candidate for a topological superconductor. SnTe nanostructures offer well-defined nanoscale morphology and high surface-to-volume ratios to enhance surface effects. Here, we study In-doped SnTe nanoplates, InxSn1-xTe, with x ranging from 0 to 0.1 and show they superconduct. More importantly, we show that In doping reduces the bulk mobility of InxSn1-xTe such that the surface states are revealed in magnetotransport despite the high bulk carrier density. This is manifested by two-dimensional linear magnetoresistance in high magnetic fields, which is independent of temperature up to 10 K. Aging experiments show that the linear magnetoresistance is sensitive to ambient conditions, further confirming its surface origin. We also show that the weak antilocalization observed in InxSn1-xTe nanoplates is a bulk effect. Thus, we show that nanostructures and reducing the bulk mobility are effective strategies to reveal the surface states and test for topological superconductors.

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Cited by in corpus (12)

• Theory of interacting topological crystalline insulators
• Surface oxidation and thermoelectric properties of indium-doped tin telluride nanowires
• Broken mirror symmetry tuned topological transport in PbTe/SnTe heterostructures
• Proximity-induced superconductivity and quantum interference in topological crystalline insulator SnTe thin film devices
• Observation of coexisting weak localization and superconducting fluctuations in strained Sn1-xInxTe thin films
• FIB synthesis of Bi2Se3 1D nanowires demonstrating the co-existence of Shubnikov-de Haas oscillations and linear magnetoresistance
• Electron and hole contributions to normal-state transport in the superconducting system Sn${}_{1-x}$In${}_x$Te
• Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures
• Two-band superconductivity of bulk and surface states in Ag thin films on Nb
• Structural Phase Transition and Carrier Density Tuning in SnSexTe1-x Nanoplates for Topological Crystalline Insulators
• Effect of gallium doping on structural and transport properties of the topological insulator Bi2Se3 grown by molecular beam epitaxy
• Non-Trivial Topological Phase in the Sn_{1-x}In_xTe Superconductor