Features of level broadening in a ring-stub system
Mesoscale and Nanoscale Physics
2009-10-31 v2
Abstract
When a one dimensional (1D) ring-stub system is coupled to an electron reservoir, the states acquire a width (or broadening characterized by poles in the complex energy plane) due to finite life time effects. We show that this broadening is limited by anti-resonances due to the stub. The differences in level broadening in presence and absence of anti-resonance is exemplified by comparison to a 1D ring coupled to an infinite reservoir. We also show that the anti-resonances due to the stub has an anchoring effect on the poles when a magnetic flux through the ring is varied. This will have implication on change in distribution of the poles in disordered multichannel situation as magnetic flux is varied.
Cite
@article{arxiv.cond-mat/9909403,
title = {Features of level broadening in a ring-stub system},
author = {P. Singha Deo and M. V. Moskalets},
journal= {arXiv preprint arXiv:cond-mat/9909403},
year = {2009}
}
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