Level-occupation switching of the Quantum Dot, and phase anomalies in mesoscopic interferometry

Abstract

For a variety of quantum dots, the widths of different single-particle levels may naturally differ by orders of magnitude. In particular, the width of one strongly coupled level may be larger than the spacing between other, very narrow, levels. We found that in this case many consecutive Coulomb blockade peaks are due to occupation of the same broad level. Between the peaks the electron jumps from this level to one of the narrow levels and the transmission through the dot at the next resonance essentially repeats that at the previous one. This offers a natural explanation of the salient features of the behavior of the transmission phase in an interferometer with a QD. The theory of this effect will be reviewed with special emphasis on the role of the interactions. New results on the dot-charging measurements and the fine structure of occupation switchings will be presented, accompanied by the unified description of the whole series of CB peaks caused by a single broad level. We then discuss the case where the system approaches the Kondo regime.

30 pages in IOP format, 11 figures

References in corpus (3)

• Phase lapses in transmission through interacting two-level quantum dots
• Minimal realization of the Orbital Kondo effect in a Quantum Dot with two Leads
• Transmission zero in a quantum dot with strong electron-electron interaction: Perturbative conductance calculations

Cited by in corpus (7)

• Dynamical stabilization and time in open quantum systems
• Lapse of transmission phase and electron molecules in quantum dots
• Exchange-correlation potentials for multi-orbital quantum dots subject to generic density-density interactions and Hund's rule coupling
• Exchange and correlation effects in the transmission phase through a few-electron quantum dot
• Phase switching in a voltage-biased Aharonov-Bohm interferometer
• Time-dependent wave packet simulations of transport through Aharanov-Bohm rings with an embedded quantum dot
• Level occupation switching with density functional theory