Spin polarized transport driven by square voltage pulses in a quantum dot system

Details Spin polarized transport driven by square voltage pulses in a quantum dot system Spin polarized transport driven by square voltage pulses in a quantum dot system

2008-06-25

arxiv.org/abs/0806.4193v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 5 figures

Scientific paper

We calculate current, spin current and tunnel magnetoresistance (TMR) for a quantum dot coupled to ferromagnetic leads in the presence of a square wave of bias voltage. Our results are obtained via time-dependent nonequilibrium Green function. Both parallel and antiparallel lead magnetization alignments are considered. The main findings include a wave of spin accumulation and spin current that can change sign as the time evolves, spikes in the TMR signal and a TMR sign change due to an ultrafast switch from forward to reverse current in the emitter lead.

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