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TT: Fachverband Tiefe Temperaturen

TT 67: Topological Insulators 5 (jointly with DS, HL, MA, and O)

TT 67.4: Vortrag

Freitag, 15. März 2013, 10:15–10:30, H18

Zero-voltage conductance peak from weak antilocalization in a Majorana nanowire — •Michael Wimmer¹, Dimitri Pikulin¹, Jan Dahlhaus¹, Henning Schomerus², and Carlo Beenakker¹ — ¹Instituut-Lorentz, Universiteit Leiden, The Netherlands — ²Department of Physics, Lancaster University, United Kingdom

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 e²/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.