Zero-voltage conductance peak from weak antilocalization in a Majorana nanowire

Pikulin, D I and Dahlhaus, J P and Wimmer, M and Schomerus, Henning and Beenakker, C. W. J. (2012) Zero-voltage conductance peak from weak antilocalization in a Majorana nanowire. New Journal of Physics, 14: 125011. ISSN 1367-2630

Abstract

We show that weak antilocalization by disorder competes with resonant Andreev reflection from a Majorana zero mode to produce a zerovoltage conductance peak of order e^2/h in a superconducting nanowire. The phase conjugation needed for quantum interference to survive a disorder average is provided by particle–hole symmetry—in the absence of timereversal symmetry and without requiring a topologically nontrivial phase. We identify methods of distinguishing the Majorana resonance from the weak antilocalization effect.