The transport properties of quantum dots with up to N = 7 electrons ranging from a weak to a strong interacting regime are investigated via the projected Hartree-Fock technique. As interactions increase radial order develops in the dot, with the formation of ring and centred-ring structures. Subsequently, angular correlations appear, signalling the formation of a Wigner molecule state. We show striking signatures of the emergence of Wigner molecules, detected in transport. In the linear regime, conductance is exponentially suppressed as the interaction strength grows. A further suppression is observed when centred-ring structures develop, or peculiar spin textures appear. In the nonlinear regime, the formation of molecular states may even lead to a conductance enhancement
Cavaliere F., De Giovannini U., Sassetti M., Kramer B. (2009). Transport properties of quantum dots in the Wigner molecule regime. NEW JOURNAL OF PHYSICS, 11(12), 123004 [10.1088/1367-2630/11/12/123004].
Transport properties of quantum dots in the Wigner molecule regime
De Giovannini U.;Sassetti M.;
2009-12-03
Abstract
The transport properties of quantum dots with up to N = 7 electrons ranging from a weak to a strong interacting regime are investigated via the projected Hartree-Fock technique. As interactions increase radial order develops in the dot, with the formation of ring and centred-ring structures. Subsequently, angular correlations appear, signalling the formation of a Wigner molecule state. We show striking signatures of the emergence of Wigner molecules, detected in transport. In the linear regime, conductance is exponentially suppressed as the interaction strength grows. A further suppression is observed when centred-ring structures develop, or peculiar spin textures appear. In the nonlinear regime, the formation of molecular states may even lead to a conductance enhancementFile | Dimensione | Formato | |
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