Density of states in coupled chains with off-diagonal disorder
P. W. Brouwer, C. Mudry, A. Furusaki
Abstract
We compute the density of states (d.o.s.) in N coupled chains with random hopping. At zero energy, the d.o.s. shows a singularity that strongly depends on the parity of N. For odd N, the d.o.s. is proportional to 1/(E ( |E|)3), with and without time-reversal symmetry. For even N, the d.o.s. is proportional to |E| in the presence of time-reversal symmetry, while there is a pseudogap, d.o.s. proportional to E |E|, in the absence of time-reversal symmetry.
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