Detecting a quantum critical point in topological SN junctions

Abstract

A spin-orbit coupled quantum wire, with one end proximate to an s-wave superconductor, can become a topological superconductor, with a Majorana mode localized at each end of the superconducting region. It was recently shown that coupling one end of such a topological superconductor to $two$ normal channels of interacting electrons leads to a novel type of frustration and a quantum critical point when both channels couple with equal strength. We propose an experimental method to access this critical point in a $single$ quantum wire and show its resilience to disorder.

Accepted in Phys. Rev. B

References in corpus (8)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor
• Observation of Majorana Fermions in a Nb-InSb Nanowire-Nb Hybrid Quantum Device
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• Towards a realistic transport modeling in a superconducting nanowire with Majorana fermions
• Zero bias conductance peak in Majorana wires made of semiconductor-superconductor hybrid structures
• Effects of finite superconducting coherence lengths and of phase gradients in topological SN and SNS junctions and rings

Cited by in corpus (1)

• Effect of Disorder on the Conductance of (non-) Topological SN Junctions