Transient Charging and Discharging of Spin-polarized Electrons in a Quantum Dot

Details Transient Charging and Discharging of Spin-polarized Electrons in a Quantum Dot Transient Charging and Discharging of Spin-polarized Electrons in a Quantum Dot

2007-04-26

arxiv.org/abs/0704.3598v2

Phys. Rev. B 76, 125318 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 6 figures. Typos corrections corresponding to the published version

Scientific paper

10.1103/PhysRevB.76.125318

We study spin-polarized transient transport in a quantum dot coupled to two ferromagnetic leads subjected to a rectangular bias voltage pulse. Time-dependent spin-resolved currents, occupations, spin accumulation, and tunneling magnetoresistance (TMR) are calculated using both nonequilibrium Green function and master equation techniques. Both parallel and antiparallel leads' magnetization alignments are analyzed. Our main findings are: a dynamical spin accumulation that changes sign in time, a short-lived pulse of spin polarized current in the emitter lead (but not in the collector lead), and a dynamical TMR that develops negative values in the transient regime. We also observe that the intra-dot Coulomb interaction can enhance even further the negative values of the TMR.

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