Theory of random multiplicative transfer matrices and its implications for quantum transport

作者: J.-L. Pichard , N. Zanon , Y. Imry , A. Douglas Stone

DOI: 10.1051/JPHYS:01990005107058700

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摘要: The two-probe conductance, g, of a disordered quantum system with N transverse scattering channels is determined by real parameters («levels») {λ i } characterizing the transfer matrix M. appropriate measure for M combined «global» maximum entropy hypothesis, leads to joint distribution th En regime quantique coherent, la conductance g d'un systeme desordonne possedant canaux de diffusion est determinee par parametres reels («niveaux») qui caracterisent sa matrice transfert La mesure adequate pour M, combinee avec une hypothese d'entropie «globale», conduit loi ces niveaux identique celle des ensembles matrices aleatoires classiques, si l'on excepte presence comportement nouveau densite ρ(λ), loin d'etre uniforme, et depend facon significative du systeme. Nous etudions en detail cette ses implications les fluctuations montrant que le specifique cet ensemble resulte composition multiplicative Pour donne quand longueur L 2 augmente, ce sont α ≃(1/2L z )ln(λ )(qui convergent vers exposants Lyapunov M) ont essentiellement uniforme. Utilisant densite, nous developpons analogie coulombienne expliquer changement statistiques accompagne transition metallique au isolant. Le correspond «phase» haute gaz coulomb, statistique classiques interactions logarithmiques, d'une «interaction» charges images pres l'origine; ceci implique normale p(g) variance universelle. Des mecanismes possibles d'apparition queues lognormales dans discutes

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