Nonuniversal Shot Noise in Disordered Quantum Wires with Channel-Number Imbalance

Details Nonuniversal Shot Noise in Disordered Quantum Wires with Channel-Number Imbalance Nonuniversal Shot Noise in Disordered Quantum Wires with Channel-Number Imbalance

2010-10-28

arxiv.org/abs/1010.5833v1

J. Phys. Soc. Jpn. 79 (2010) 104706 (4 pages)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 3 figures

Scientific paper

The number of conducting channels for one propagating direction is equal to that for the other direction in ordinary quantum wires. However, they can be imbalanced in graphene nanoribbons with zigzag edges. Employing the model system in which a degree of channel-number imbalance can be controlled, we calculate the shot-noise power at zero frequency by using the Boltzmann-Langevin approach. The shot-noise power in an ordinary diffusive conductor is one-third of the Poisson value. We show that with increasing the degree of channel-number imbalance, the universal one-third suppression breaks down and a highly nonuniversal behavior of shot noise appears.

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