Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-11-11
New Journal of Physics 11, 123004 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
26 pages, 14 figures, Accepted for publication on New Journal of Physics
Scientific paper
10.1088/1367-2630/11/12/123004
The transport properties of quantum dots with up to N=7 electrons ranging from the weak to the 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 centered-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 centered-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 Fabio
Giovannini U. de
Kramer Bernhard
Sassetti Maura
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