Full counting statistics of a chaotic cavity with asymmetric leads
Abstract
We study the statistics of charge transport in a chaotic cavity attached to external reservoirs by two openings of different size which transmit non-equal number of quantum channels. An exact formula for the cumulant generating function has been derived by means of the Keldysh-Green function technique within the circuit theory of mesoscopic transport. The derived formula determines the full counting statistics of charge transport, i.e., the probability distribution and all-order cumulants of current noise. It is found that, for asymmetric cavities, in contrast to other mesoscopic systems, the third-order cumulant changes the sign at high biases. This effect is attributed to the skewness of the distribution of transmission eigenvalues with respect to forward/backward scattering. For a symmetric cavity we find that the third cumulant approaches a voltage-independent constant proportional to the temperature and the number of quantum channels in the leads.
Keywords
Cite
@article{arxiv.cond-mat/0403388,
title = {Full counting statistics of a chaotic cavity with asymmetric leads},
author = {O. M. Bulashenko},
journal= {arXiv preprint arXiv:cond-mat/0403388},
year = {2007}
}
Comments
new section on probability distribution and new references added