title: Fano and Dicke effects in a double Rashba-ring system.
abstract: The electronic transport in a system of two quantum rings side-coupled to a quantum wire is studied via a single-band tunneling tight-binding Hamiltonian. We derived analytical expressions for the conductance and spin polarization when the rings are threaded by magnetic fluxes with Rashba spin-orbit interaction. We show that by using the Fano and Dicke effects this system can be used as an efficient spin filter even for small spin-orbit interaction and small values of magnetic fluxes. We compare the spin-dependent polarization of this design and the polarization obtained with one ring side-coupled to a quantum ring. As a main result, we find better spin polarization capabilities as compared to the one-ring design.
authors.affiliation: Departamento de Física, Universidad Católica del Norte, Casilla 1280, Antofagasta, Chile.
authors.forename: V M
authors.initials: VM
authors.lastname: Apel
authors.forename: P A
authors.initials: PA
authors.lastname: Orellana
authors.forename: M
authors.initials: M
authors.lastname: Pacheco