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

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 $ν(\varepsilon) \propto \varepsilon^{-1}|\ln\varepsilon|^{-3}$, whereas $ν(\varepsilon) \propto \varepsilon^{|α|-1}$ has a power-law singularity for small energies $\varepsilon$ 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 $α$ to the wire's transport properties at zero energy and, hence, to the mean free path $l$ and the superconducting coherence length $ξ$.

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