Conductance Fluctuations in Disordered Wires with Perfectly Conducting Channels

Abstract

We study conductance fluctuations in disordered quantum wires with unitary symmetry focusing on the case in which the number of conducting channels in one propagating direction is not equal to that in the opposite direction. We consider disordered wires with $N+m$ left-moving channels and $N$ right-moving channels. In this case, $m$ left-moving channels become perfectly conducting, and the dimensionless conductance $g$ for the left-moving channels behaves as $g\to m$ in the long-wire limit. We obtain the variance of $g$ in the diffusive regime by using the Dorokhov-Mello-Pereyra-Kumar equation for transmission eigenvalues. It is shown that the universality of conductance fluctuations breaks down for $m\ne 0$ unless $N$ is very large.

6 pages, 2 figures

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Cited by in corpus (5)

• Conductance quantization and transport gap in disordered graphene nanoribbons
• Edge Effect on Electronic Transport Properties of Graphene Nanoribbons and Presence of Perfectly Conducting Channel
• Anomalous Enhancement of the Boltzmann Conductivity in Disordered Zigzag Graphene Nanoribbons
• Conductance Distribution in Disordered Quantum Wires with a Perfectly Conducting Channel
• Nonuniversal Shot Noise in Disordered Quantum Wires with Channel-Number Imbalance