We study coupled semiconductor quantum dots theoretically through 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 a function of the inter-dot distance d; at intermediate values of d we predict a new phase that should be observable in the addition spectra and in the magnetization changes. (C) 1999 Elsevier Science Ltd. All rights reserved.
Multiple quantum phases in artificial double-dot molecules / M., Rontani; F., Rossi; Manghi, Franca; Molinari, Elisa. - In: SOLID STATE COMMUNICATIONS. - ISSN 0038-1098. - STAMPA. - 112:(1999), pp. 151-155. [10.1016/S0038-1098(99)00305-1]
Multiple quantum phases in artificial double-dot molecules
MANGHI, Franca;MOLINARI, Elisa
1999
Abstract
We study coupled semiconductor quantum dots theoretically through 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 a function of the inter-dot distance d; at intermediate values of d we predict a new phase that should be observable in the addition spectra and in the magnetization changes. (C) 1999 Elsevier Science Ltd. All rights reserved.
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