Electrically Tunable Spin Polarization in a Carbon-Nanotube Spin Diode

Details Electrically Tunable Spin Polarization in a Carbon-Nanotube Spin Diode Electrically Tunable Spin Polarization in a Carbon-Nanotube Spin Diode

2007-10-11

arxiv.org/abs/0710.2297v1

Physical Review Letters 100, 156601 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

17 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.156601

We have studied the current through a carbon nanotube quantum dot with one ferromagnetic and one normal-metal lead. For the values of gate voltage at which the normal lead is resonant with the single available non-degenerate energy level on the dot, we observe a pronounced decrease in the current for one bias direction. We show that this rectification is spin-dependent, and that it stems from the interplay between the spin accumulation and the Coulomb blockade on the quantum dot. Our results imply that the current is spin-polarized for one direction of the bias, and that the degree of spin polarization is fully and precisely tunable using the gate and bias voltages. As the operation of this spin diode does not require high magnetic fields or optics, it could be used as a building block for electrically controlled spintronic devices.

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