Statistics of resonances and delay times: a criterion for metal-insulator transitions |
| |
Authors: | Kottos Tsampikos Weiss Matthias |
| |
Institution: | Max-Planck-Institut für Str?mungsforschung und Fakult?t Physik der Universit?t G?ttingen, Bunsenstrasse 10, D-37073 G?ttingen, Germany. |
| |
Abstract: | We study the distributions of the normalized resonance widths P(Gamma;) and delay times P(tau;) for 3D disordered tight-binding systems at the metal-insulator transition (MIT) by attaching leads to the boundary sites. Both distributions are scale invariant, independent of the microscopic details of the random potential and the number of channels. Theoretical considerations suggest the existence of a scaling theory for P(Gamma;) in finite samples, and numerical calculations confirm this hypothesis. Based on this, we give a new criterion for the determination and analysis of the MIT. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|