Transport across a carbon nanotube quantum dot contacted with ferromagnetic leads: experiment and non-perturbative modeling

Alois Dirnaichner, Milena Grifoni, Andreas Prüfling, Daniel Steininger, Andreas K. Hüttel, Christoph Strunk

Published 2015-02-06Version 1

We present measurements of tunneling magneto-resistance (TMR) in single-wall carbon nanotubes attached to ferromagnetic contacts in the Coulomb blockade regime. Strong variations of the TMR with gate voltage over a range of four conductance resonances, including a peculiar double-dip signature, are observed. The data is compared to calculations in the "dressed second order" (DSO) framework. In this non-perturbative theory, conductance peak positions and linewidths are affected by charge fluctuations incorporating the properties of the CNT quantum dot and the ferromagnetic leads. The theory is able to qualitatively reproduce the experimental data.