Quantized Conductance at the Majorana Phase Transition in a Disordered Superconducting Wire
A. R. Akhmerov, J. P. Dahlhaus, F. Hassler, M. Wimmer, C. W. J. Beenakker
DOI 10.1103/PhysRevLett.106.057001 · Physical Review Letters
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Abstract
Superconducting wires without time-reversal and spin-rotation symmetries can be driven into a topological phase that supports Majorana bound states. Direct detection of these zero-energy states is complicated by the proliferation of low-lying excitations in a disordered multimode wire. We show that the phase transition itself is signaled by a quantized thermal conductance and electrical shot noise power, irrespective of the degree of disorder. In a ring geometry, the phase transition is signaled by a period doubling of the magnetoconductance oscillations. These signatures directly follow from the identification of the sign of the determinant of the reflection matrix as a topological quantum number.
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| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| InAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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