Effective Random Matrix Theory description of chaotic Andreev billiards

Details Effective Random Matrix Theory description of chaotic Andreev billiards Effective Random Matrix Theory description of chaotic Andreev billiards

2003-09-12

arxiv.org/abs/cond-mat/0309306v2

Physical Review B 70, 052512 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.052512

An effective random matrix theory description is developed for the universal gap fluctuations and the ensemble averaged density of states of chaotic Andreev billiards for finite Ehrenfest time. It yields a very good agreement with the numerical calculation for Sinai-Andreev billiards. A systematic linear decrease of the mean field gap with increasing Ehrenfest time $\tau_E$ is observed but its derivative with respect to $\tau_E$ is in between two competing theoretical predictions and close to that of the recent numerical calculations for Andreev map. The exponential tail of the density of states is interpreted semi-classically.

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