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Nonmonotonic charge occupation in double dots

Jürgen König and Yuval Gefen
Phys. Rev. B 71, 201308(R) – Published 27 May 2005

Abstract

We study the occupation of two electrostatically coupled single-level quantum dots with spinless electrons as a function of gate voltage. While the total occupation of the double-dot system varies monotonically with gate voltage, we predict that the competition between tunneling and Coulomb interaction can give rise to a nonmonotonic filling of the individual quantum dots. This nonmonotonicity is a signature of the correlated nature of the many-body wave function in the reduced Hilbert space of the dots. We identify two mechanisms for this nonmonotonic behavior, which are associated with changes in the spectral weights and the positions, respectively, of the excitation spectra of the individual quantum dots. An experimental setup to test these predictions is proposed.

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  • Received 11 March 2005

DOI:https://doi.org/10.1103/PhysRevB.71.201308

©2005 American Physical Society

Authors & Affiliations

Jürgen König1 and Yuval Gefen2

  • 1Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany
  • 2Department of Condensed Matter Physics, The Weizmann Institute of Science, 76100 Rehovot, Israel

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Issue

Vol. 71, Iss. 20 — 15 May 2005

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