Nonlocal conductance reveals helical superconductors
B. Béri
DOI 10.1103/PhysRevB.85.140501 · Physical Review B
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Abstract
Recent theoretical progress has identified a class of time-reversal invariant topological superconductors, called helical superconductors. While candidate materials exist, to the best of our knowledge, no such system has been observed yet in experiments. Existing proposals for the detection of this phase provide only indirect and partial information, and often are quite difficult to implement experimentally. Here we show that the presence of this phase can be directly probed through the easily measurable nonlocal charge conductance. Focusing on a ring geometry, we suggest two experiments that provide robust qualitative signatures that unambiguously reveal the helical superconductor phase.
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