Ehrenfest time and the coherent backscattering off ballistic cavities
Saar Rahav, Piet W. Brouwer
Abstract
If the Ehrenfest time tauE of a ballistic cavity is not negligible in comparison to its dwell time tauD, the weak localization correction to the cavity's transmission is suppressed proportional to exp(-tauE/tauD). At the same time, quantum interference enhances the probability of reflection into the mode of incidence by a factor two. This `enhanced backscattering' does not depend on the Ehrenfest time. We show that, in addition to the diagonal enhanced backscattering, there are off-diagonal contributions to coherent backscattering that become relevant if the Ehrenfest time is not negligible.
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