Fano versus Kondo Resonances in a Multilevel "Semi-Open" Quantum Dot

Details Fano versus Kondo Resonances in a Multilevel "Semi-Open" Quantum Dot Fano versus Kondo Resonances in a Multilevel "Semi-Open" Quantum Dot

2004-06-04

arxiv.org/abs/cond-mat/0406112v2

Phys. Rev. Lett. 93, 186805 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 eps figures, RevTex format, revised version, to appear in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.93.186805

Linear conductance across a large quantum dot via a single level e_0 with large hybridization to the contacts is strongly sensitive to quasi-bound states localized in the dot and weakly coupled to e_0. It oscillates with the gate voltage due to interference of the Fano type. At low temperature and Coulomb blockade, Kondo correlations damp the oscillations on an extended range of gate voltage values, by freezing the occupancy of the e_0 level itself. As a consequence, antiresonances of Fano origin are washed out. The results are in good correspondence with experimental data for a large quantum dot in the semi-open regime.

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