Discrete charging of a quantum dot strongly coupled to external leads

Abstract

We examine a quantum dot with $N_{\mathrm{dot}}$ 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 $N_{\mathrm{dot}}-N$ 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.

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

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• Phase lapses in transmission through interacting two-level quantum dots
• Theory of charge sensing in quantum-dot structures
• Interference effects in interacting quantum dots
• Transmission phase lapses in quantum dots: the role of dot-lead coupling asymmetry
• Level-occupation switching of the Quantum Dot, and phase anomalies in mesoscopic interferometry
• Coulomb blockade without potential barriers
• Investigation of the coupling asymmetries at double-slit interference experiments