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Interaction-induced strong localization in quantum dots

A. D. Güçlü, Amit Ghosal, C. J. Umrigar, and Harold U. Baranger
Phys. Rev. B 77, 041301(R) – Published 2 January 2008

Abstract

We argue that Coulomb blockade phenomena are a useful probe of the crossover to strong correlation in quantum dots. Through calculations at low density using variational and diffusion quantum Monte Carlo (up to rs55), we find that the addition energy shows a clear progression from features associated with shell structure to those caused by commensurability of a Wigner crystal. This crossover (which occurs near rs20 for spin-polarized electrons) is, then, a signature of interaction-driven localization. As the addition energy is directly measurable in Coulomb blockade conductance experiments, this provides a direct probe of localization in the low density electron gas.

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  • Received 5 December 2007

DOI:https://doi.org/10.1103/PhysRevB.77.041301

©2008 American Physical Society

Authors & Affiliations

A. D. Güçlü1, Amit Ghosal2, C. J. Umrigar3, and Harold U. Baranger1

  • 1Department of Physics, Duke University, Box 90305, Durham, North Carolina 27708-0305
  • 2Physics Department, University of California Los Angeles, Los Angeles, California 90095-1547, USA
  • 3Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA

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Issue

Vol. 77, Iss. 4 — 15 January 2008

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