Abstract
In a one-dimensional spinless -wave superconductor with coherence length , disorder induces a phase transition between a topologically nontrivial phase and a trivial insulating phase at the critical mean-free path . Here, we show that a multichannel spinless -wave superconductor goes through an alternation of topologically trivial and nontrivial phases upon increasing the disorder strength, the number of phase transitions being equal to the channel number . The last phase transition, from a nontrivial phase into the trivial phase, takes place at a mean-free path , parametrically smaller than the critical mean-free path in one dimension. Our result is valid in the limit that the wire width is much smaller than the superconducting coherence length .
- Received 13 February 2013
DOI:https://doi.org/10.1103/PhysRevB.88.060509
©2013 American Physical Society