1206.6687 (D. I. Pikulin et al.)

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

D. I. Pikulin, J. P. Dahlhaus, M. Wimmer, C. W. J. Beenakker

We show that weak antilocalization by disorder competes with resonant Andreev reflection from a Majorana zero-mode to produce a zero-voltage 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 time-reversal symmetry and without requiring a topologically nontrivial phase. We identify methods to distinguish the Majorana resonance from the weak antilocalization effect.

View original: http://arxiv.org/abs/1206.6687