Disorder and interaction induced pairing in the addition spectra of quantum dots

Abstract

We have investigated numerically the electron addition spectra in quantum dots containing a small number (N < 11) of interacting electrons, in presence of strong disorder. For a short-range Coulomb repulsion, we find regimes in which two successive electrons enter the dot at very close values of the chemical potential. In the strongly correlated regime these close additions, or pairing, are associated with electrons tunneling into distinct electron puddles within the dot. We discuss the tunneling rates at pairing, and we argue that our results are related to a phenomenon known as "bunching", recently observed experimentally.

4 pages, 5 figures

References in corpus (4)

• Periodic and Aperiodic Bunching in the Addition Spectra of Quantum Dot
• Charging Spectrum and Configurations of a Wigner Crystal Island
• Absence of bimodal peak spacing distribution in the Coulomb blockade regime
• The Localization-Delocalization Transition in Quantum Dots

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