6533b829fe1ef96bd128a5c3
RESEARCH PRODUCT
Transport properties of quantum dots in the Wigner molecule regime
Fabio CavaliereBernhard KramerBernhard KramerMaura SassettiU. De Giovanninisubject
PhysicsCondensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsTransportquantum dotFOS: Physical sciencesGeneral Physics and AstronomyConductanceElectronRing (chemistry)Settore FIS/03 - Fisica Della MateriaNonlinear systemOrder (biology)Quantum dotMesoscale and Nanoscale Physics (cond-mat.mes-hall)MoleculeSpin (physics)description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-12-03 |