Proximity-induced superconductivity within the InAs/GaSb edge conducting state

Abstract

We experimentally investigate Andreev transport through the interface between an indium superconductor and the edge of the InAs/GaSb bilayer. To cover all possible regimes of InAs/GaSb spectrum, we study samples with 10 nm, 12 nm, and 14 nm thick InAs quantum wells. For the trivial case of a direct band insulator in 10~nm samples, differential resistance demonstrates standard Andreev reflection. For InAs/GaSb structures with band inversion (12~nm and 14 nm samples), we observe distinct low-energy structures, which we regard as direct evidence for the proximity-induced superconductivity within the current-carrying edge state. For 14~nm InAs well samples, we additionally observe mesoscopic-like resistance fluctuations, which are subjected to threshold suppression in low magnetic fields.

arXiv commentfinal version

References in corpus (31)

• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• New directions in the pursuit of Majorana fermions in solid state systems
• Quantum Spin Hall Effect
• Search for Majorana fermions in superconductors
• Topological Insulator Materials
• Andreev reflection and Klein tunneling in graphene
• Fermionic quantum computation
• Evidence for Helical Edge Modes in Inverted InAs/GaSb Quantum Wells
• Quantum Spin Hall Effect in Inverted Type II Semiconductors
• Specular Andreev reflection in graphene
• Observation of Quantum Spin Hall States in InAs/GaSb Bilayers under Broken Time-Reversal Symmetry
• Induced Superconductivity in the Quantum Spin Hall Edge
• Spin Hall Insulator
• Imaging currents in HgTe quantum wells in the quantum spin Hall regime
• Edge-mode Superconductivity in a Two Dimensional Topological Insulator
• Perfect Andreev Reflection of Helical Edge Modes in InAs/GaSb Quantum Wells
• Images of edge current in InAs/GaSb quantum wells
• Edge Channel Transport in InAs/GaSb Topological Insulating Phase
• Transport in disordered two-dimensional topological insulator
• Edge Transport in the Trivial Phase of InAs/GaSb
• Probing the helical edge states of a topological insulator by Cooper-pair injection
• Specular Andreev Reflection in Inversion-symmetric Weyl-semimetals
• From Andreev bound states to Majorana fermions in topological wires on superconducting substrates : a story of mutation
• Phase Coherence and Andreev Reflection in Topological Insulator Devices
• Transport spectroscopy of induced superconductivity in the three-dimensional topological insulator HgTe
• Andreev reflection at the edge of a two-dimentional semimetal
• Conductance oscillations at the interface between a superconductor and the helical edge channel in a narrow HgTe quantum well
• On the impact of strain on the electronic properties of InAs/GaSb quantum well systems
• Conductance spectroscopy of a proximity induced superconducting topological insulator

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• Band gap reconstruction at the interface between black phosphorus and a gold electrode
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• Magnetically stable zero-bias anomaly in Andreev contact to the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Electrical tuning of helical edge states in topological multilayers
• Quantum Transport Properties of an Exciton Insulator/Superconductor Hybrid Junction
• Coalescence of Andreev bound states on the surface of a chiral topological semimetal