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Proceedings Paper

Stability diagram and exchange interaction in coupled quantum dots in magnetic fields
Author(s): L.-X. Zhang; D. V. Melnikov; J.-P. Leburton
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Paper Abstract

Properties of the stability diagram and exchange energy of a few-electron laterally coupled quantum dots in magnetic fields are investigated. The calculations are performed by numerically exact diagonalization of the many-body Schroedinger equation. We show variations of the energy separation between the single-particle ground and first excited states, and the exchange energy with biases on the two dots at different magnetic fields. Two-dimensional single-particle wavefunction and electron density profiles show electron localization with magnetic fields. From the extracted double-triple point separation on the stability diagram, we also show that the coupling strength decrease as the magnetic field increases.

Paper Details

Date Published: 12 May 2006
PDF: 7 pages
Proc. SPIE 6244, Quantum Information and Computation IV, 624406 (12 May 2006); doi: 10.1117/12.666043
Show Author Affiliations
L.-X. Zhang, Univ. of Illinois at Urbana-Champaign (United States)
D. V. Melnikov, Univ. of Illinois at Urbana-Champaign (United States)
J.-P. Leburton, Univ. of Illinois at Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 6244:
Quantum Information and Computation IV
Eric J. Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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