Nonlocal conductance reveals helical superconductors

Details Nonlocal conductance reveals helical superconductors Nonlocal conductance reveals helical superconductors

2011-02-22

arxiv.org/abs/1102.4541v1

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

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.

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