Coherent transport in multi-branch circuits
Mesoscale and Nanoscale Physics
2014-03-31 v3
Abstract
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.
Cite
@article{arxiv.1109.1575,
title = {Coherent transport in multi-branch circuits},
author = {A. Ziletti and F. Borgonovi and G. L. Celardo and F. M. Izrailev and L. Kaplan and V. G. Zelevinsky},
journal= {arXiv preprint arXiv:1109.1575},
year = {2014}
}
Comments
Phys. Rev. B 85, 052201 (2012). 5 pages