Shot noise from action correlations
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We consider universal shot noise in ballistic chaotic cavities from a semiclassical point of view and show that it is due to action correlations within certain groups of classical trajectories. Using quantum graphs as a model system we sum these trajectories analytically and find agreement with random-matrix theory. Unlike all action correlations which have been considered before, the correlations relevant for shot noise involve four trajectories and do not depend on the presence of any symmetry.
4 pages, 2 figures (a mistake in version 1 has been corrected)
4 pages, 2 figures (a mistake in version 1 has been corrected)