title: Spin filtering by field-dependent resonant tunneling.
abstract: We consider theoretically transport in a spinful one-channel interacting quantum wire placed in an external magnetic field. For the case of two pointlike impurities embedded in the wire, under a small voltage bias the spin-polarized current occurs at special points in the parameter space, tunable by a single parameter. At sufficiently low temperatures complete spin polarization may be achieved, provided repulsive interaction between electrons is not too strong.
authors.affiliation: Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany.
authors.forename: Zoran
authors.initials: Z
authors.lastname: Ristivojevic
authors.forename: George I
authors.initials: GI
authors.lastname: Japaridze
authors.forename: Thomas
authors.initials: T
authors.lastname: Nattermann