Coherent transport in multibranch quantum circuits

Fausto Borgonovi, Giuseppe Celardo, Felix Izrailev, A Ziletti, L Kaplan, V. Zelevinsky

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

Abstract

An open multibranch quantum circuit is considered from the viewpoint of coherent electron or wave transport, both with and without intrinsic disorder. Starting with the closed system, we give analytical conditions for the appearance of two isolated localized states out of the energy band. In the open system, using the method of the effective non-Hermitian Hamiltonian, we study signal transmission through such a circuit, with an important result of a long lifetime of localized states. When the average level width becomes comparable to the mean level spacing, the superradiant transition occurs. In the case of onsite disorder, we find an analytical estimate, confirmed by numerical data, for the robustness of the isolated states and their role in transport processes.
Lingua originaleEnglish
pagine (da-a)052201-052206
Numero di pagine6
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume85
DOI
Stato di pubblicazionePubblicato - 2012

Keywords

  • quantum transport

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