Fano resonances and decoherence in transport through quantum dots

Details Fano resonances and decoherence in transport through quantum dots Fano resonances and decoherence in transport through quantum dots

2004-12-20

arxiv.org/abs/cond-mat/0412544v1

Physica E 29, 325 (2005).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 7 figures, submitted to Physica E (conference proceedings)

Scientific paper

10.1016/j.physe.2005.05.030

A tunable microwave scattering device is presented which allows the controlled variation of Fano line shape parameters in transmission through quantum billiards. We observe a non-monotonic evolution of resonance parameters that is explained in terms of interacting resonances. The dissipation of radiation in the cavity walls leads to decoherence and thus to a modification of the Fano profile. We show that the imaginary part of the complex Fano q-parameter allows to determine the absorption constant of the cavity. Our theoretical results demonstrate further that the two decohering mechanisms, dephasing and dissipation, are equivalent in terms of their effect on the evolution of Fano resonance lineshapes.

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