Shot noise in generic quantum dots: crossover from ballistic to diffusive transport

Details Shot noise in generic quantum dots: crossover from ballistic to diffusive transport Shot noise in generic quantum dots: crossover from ballistic to diffusive transport

2002-08-08

arxiv.org/abs/cond-mat/0208175v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 3 figures; submitted to Proceedings of the 26th International Conference on the Physics of Semiconductors (ICPS 2002,

Scientific paper

We study shot noise for generic quantum dots coupled to two leads and allow for an arbitrary strength of diffractive impurity scattering inside the dots. The ballistic quantum dots possess a mixed classical phase space, where regular and chaotic regions coexist. In absence of disorder, the noise is systematically suppressed below the universal value of fully chaotic systems, by an amount which varies with the positions of the leads. This suppression is due to the deterministic nature of transport through regular regions and along short chaotic trajectories, and disappears by increasing the scattering rate, which is incorporated by using the Poisson kernel of random matrix theory.

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