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

Abstract

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 carbon nanotube quantum dot and the ferromagnetic leads. The theory is able to qualitatively reproduce the experimental data.

14 pages, 13 figures

References in corpus (8)

• Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Large spin-orbit coupling in carbon nanotubes
• Spin effects in single electron tunneling
• Permalloy-based carbon nanotube spin-valve
• Magnetoresistance of a quantum dot with spin-active interfaces
• Spin transport across carbon nanotube quantum dots
• Anomalous magnetization of a carbon nanotube as an excitonic insulator

Cited by in corpus (1)

• Theory of box-model hyperfine couplings and transport signatures of long-range nuclear-spin coherence in a quantum-dot spin valve