Groupe de Physique Statistique

Equipe 106, Institut Jean Lamour

                     
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Articles dans des revues à comité de lecture

Charge and spin polarized currents in mesoscopic rings with Rashba spin-orbit interactions coupled to an electron reservoir
Ellner M., Bolívar N., Berche B., Medina E.
Phys. Rev. B 90 (2014) 085305
DOI : 10.1103/PhysRevB.90.085305
ArXiv : arxiv:1406.4659 [PDF]

The electronic states of a mesoscopic ring are assessed in the presence of Rashba Spin Orbit coupling and a U(1) gauge field. Spin symmetric coupling to an ideal lead is implemented following Buttiker’s voltage probe. The exact density of states is derived using the reservoir uncoupled eigenstates as basis functions mixed by the reservoir coupling. The decay time of uncoupled electron eigenstates is derived by fitting the broadening profiles. The spin and charge persistent currents are computed in the presence of the SO interaction and the reservoir coupling for two distinct scenarios of the electron filling fraction. The degradation of the persistent currents depends uniformly of the reservoir coupling but nonuniformly in temperature, the latter due to the fact that currents emerge from different depths of the fermi sea, and thus for some regimes of flux, they are provided with a protective gap. Such flux regimes can be tailored by the SO coupling for both charge and spin currents.



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