Nonlocal conductance reveals helical superconductors

Abstract

Helical superconductors form a two dimensional, time-reversal invariant topological phase characterized by a Kramers pair of Majorana edge modes (helical Majorana modes). Existing detection schemes to identify this phase rely either on spin transport properties, which are quite difficult to measure, or on local charge transport, which allows only a partial identification. Here we show that the presence of helical Majorana modes can be unambiguously revealed by measuring the nonlocal charge conductance. Focusing on a superconducting ring, we suggest two experiments that provide unique and robust signatures to detect the helical superconductor phase.

4 pages, 2 figures

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• Dephasing-enabled triplet Andreev conductance
• Tunneling between Two Helical Superconductors via Majorana Edge Channels

Cited by in corpus (11)

• Topological surface states in nodal superconductors
• Pairing symmetry and dominant band in Sr2RuO4
• Spin-helical transport in normal and superconducting topological insulators
• Intrinsic Time-reversal-invariant Topological Superconductivity in Thin Films of Iron-based Superconductors
• Time-reversal anomaly and Josephson effect in time-reversal invariant topological superconductors
• Signatures of Majorana Fermions in Topological Insulator Josephson Junction Devices
• Phase-locked magnetoconductance oscillations as a probe of Majorana edge states
• Absence of Aharonov-Bohm effect of chiral Majorana fermion edge states
• Two-impurity helical Majorana problem
• Tunneling between helical Majorana modes and helical Luttinger liquids
• The Andreev crossed reflection -a Majorana path integral approach