Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.47: Poster

Donnerstag, 29. März 2007, 14:00–17:45, Poster A

Fingerprints of the magnetic polaron in nonequilibrium electron transport through a quantum wire coupled to a ferromagnetic spin chain — •Frank Reininghaus, Thomas Korb, and Herbert Schoeller — Institut für Theoretische Physik A, RWTH Aachen, 52056 Aachen, Germany

We study nonequilibrium quantum transport through a mesoscopic wire coupled via local exchange to a ferromagnetic spin chain [1]. Using the Keldysh formalism in self-consistent Born approximation, we identify fingerprints of the magnetic polaron state formed by hybridization of electronic and magnon states. Due to its low decoherence rate, we find coherent transport signals. Both elastic and inelastic peaks of the differential conductance are discussed as function of external magnetic fields, the polarization of the leads and the electronic level spacing of the wire.
[1] F. Reininghaus, T. Korb, and H. Schoeller, Phys. Rev. Lett. 97, 026803 (2006)