Density of states at disorder-induced phase transitions in a multichannel Majorana wire

Abstract

An $N$-channel spinless p-wave superconducting wire is known to go through a series of $N$ topological phase transitions upon increasing the disorder strength. Here, we show that at each of those transitions the density of states shows a Dyson singularity $\nu (\epsilon )\propto {\epsilon }^{-1}|\ln \epsilon {|}^{-3}$, whereas $\nu (\epsilon )\propto {\epsilon }^{|\alpha |-1}$ has a power-law singularity for small energies $\epsilon$ away from the critical points. Using the concept of "superuniversality" [Gruzberg, Read, and Vishveshwara, Phys. Rev. B 71, 245124 (2005)], we are able to relate the exponent $\alpha$ to the wire's transport properties at zero energy and, hence, to the mean free path $l$ and the superconducting coherence length $\xi$.

arXiv comment4+1 pages, 3 figures

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• Benefits of weak disorder in one dimensional topological superconductors
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