Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3

TT 21.3: Vortrag

Dienstag, 27. März 2012, 10:00–10:15, BH 334

Nonequilibrium transport through quantum dots with Dzyaloshinsky-Moriya-Kondo interaction — •Mikhail Pletyukhov and Dirk Schuricht — Institut für Theorie der statistischen Physik, RWTH Aachen, Physikzentrum, D - 52074 Aachen

We study nonequilibrium transport through a single-orbital Anderson model in a magnetic field with spin-dependent hopping amplitudes. In the cotunneling regime, it is described by an effective spin-1/2 dot with a Dzyaloshinsky-Moriya-Kondo (DMK) interaction between the spin on the dot and the electron spins in the leads. Using a real-time renormalization group technique we show that at low temperatures (i) the DMK interaction is strongly renormalized, (ii) the renormalized magnetic field acquires a linear voltage dependence, and (iii) the differential conductance exhibits a voltage asymmetry which is strongly enhanced by logarithmic corrections. We propose transport measurements in which these signatures can be observed.