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HL: Fachverband Halbleiterphysik

HL 75: Transport: Spintronics and magnetotransport 1 (TT, jointly with HL, MA)

HL 75.8: Talk

Thursday, March 14, 2013, 11:30–11:45, H18

A carbon nanotube quantum dot in the intermediate coupling regime: Conductance and tunnel magnetoresistance — •Alois Dirnaichner, Johannes Kern, and Milena Grifoni — Universität Regensburg

We discuss transport through carbon nanotube quantum dots with intermediate coupling to ferromagnetic leads. In a density matrix approach we sum up infinite-order corrections due to charge fluctuations within the dressed second order approximation (DSO) [1], allowing us to go beyond the sequential tunneling regime. From the master equation we deduce conductance and tunnel magnetoresistance (TMR). The results are compared to experimental data with a pronounced gate modulation of the TMR and negative TMR features in particular.
[1] J. Kern and M. Grifoni, arXiv:1209.4995v1