Physics – Condensed Matter
Scientific paper
1995-07-26
JETP Lett. 63 (1996) 1026
Physics
Condensed Matter
4 two-column pages, RevTex. text is slightly modified; some misprints are corrected
Scientific paper
10.1134/1.567120
We derive the explicit expression for the distribution of resonance widths in a chaotic quantum system coupled to continua via M equivalent open channels. It describes a crossover from the $\chi^2$ distribution (regime of isolated resonances) to a broad power-like distribution typical for the regime of overlapping resonances. The first moment is found to reproduce exactly the Moldauer-Simonius relation between the mean resonance width and the transmission coefficient. This fact may serve as another manifestation of equivalence between the spectral and the ensemble averaging.
Fyodorov Yan V.
Sommers Hans Juergen
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