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TT: Tiefe Temperaturen

TT 21: Transport: Nanoelectronics II - Spintronics and Magnetotransport - Part 2

TT 21.6: Talk

Tuesday, March 28, 2006, 17:45–18:00, HSZ 105

Fingerprints of spin polaron states in quantum transport through mesoscopic wires — •Herbert Schoeller, Frank Reininghaus, and Thomas Korb — Institut für Theoretische Physik A, RWTH Aachen, 52056 Aachen

Using the Keldysh formalism in combination with a self-consistent diagrammatic approach, we investigate the possibility to find fingerprints of spinpolaron states in quantum transport trough a mesoscopic quantum wire coupled via local exchange to a ferromagnetic spin chain. The spin polaron state occurs due to a hybridization between electronic states and magnons. Due to its low decoherence rate we find coherent transport and a new peak in the differential conductance as function of bias voltage. In addition we find peaks from the usual scattering states and inelastic tunneling. We discuss the peak structure as function of an external magnetic field, polarization of the leads, and the level spacing on the quantum wire.