Coherent transport in multi-branch circuits

Details Coherent transport in multi-branch circuits Coherent transport in multi-branch circuits

2011-09-07

arxiv.org/abs/1109.1575v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, submitted to PRB, rapid communications

Scientific paper

A multi-branch quantum circuit is considered from the viewpoint of coherent electron or wave transport. 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. The super-radiant transition occurs when the average level width becomes comparable to the mean level spacing. We consider also the case with on-site disorder and find an analytical estimate, confirmed by numerical data, for the robustness of the isolated states and their role in transport processes.

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