Discrete charging of a quantum dot strongly coupled to external leads

Details Discrete charging of a quantum dot strongly coupled to external leads Discrete charging of a quantum dot strongly coupled to external leads

2003-07-30

arxiv.org/abs/cond-mat/0307730v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures (accepted for publication in EPL)

Scientific paper

10.1209/epl/i2004-10258-6

We examine a quantum dot with $N_{\rm dot}$ levels which is strongly coupled to leads for varying number of channels $N$ in the leads. It is shown both analytically and numerically that for strong couplings between the dot and the leads, at least $N_{\rm dot}-N$ bound states (akin to subradiant states in optics) remain on the dot. These bound states exhibit discrete charging and, for a significant range of charging energies, strong Coulomb blockade behavior as function of the chemical potential. The physics changes for large charging energy where the same (superradiant) state is repeatedly charged.

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