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Theory of Addition Spectra in Double Quantum Dots: Single-Particle Tunneling vs Coulomb Interactions

Published online by Cambridge University Press:  10 February 2011

M. Rontani ,
F. Rossi ,
F. Manghi  and
E. Molinari
M. Rontani
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/a, 41100 Modena, Italy
F. Rossi
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/a, 41100 Modena, Italy
F. Manghi
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/a, 41100 Modena, Italy
E. Molinari
Affiliation:
Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università degli Studi di Modena e Reggio Emilia, Via Campi 213/a, 41100 Modena, Italy
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Abstract

We study coupled semiconductor quantum dots theoretically using a generalized Hubbard approach, where intra- and inter-dot Coulomb correlation, as well as tunneling effects are described on the basis of realistic electron wavefunctions. We find that the ground-state configuration of vertically coupled double dots undergoes non-trivial quantum transitions as the inter-dot distance d changes; at intermediate values of d we predict a new phase that should be observable in the addition spectra and in the magnetization changes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 571: Symposium W – Semiconductor Quantum Dots , 1999 , 179
Copyright
Copyright © Materials Research Society 2000

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References

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