期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 77, 期 5, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.054702
关键词
perfectly conducting channel; universal conductance fluctuations; unitary class; DMPK equation
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 -> 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 not equal 0 unless N is very large.
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