6 research outputs found
Spin polarized transport driven by square voltage pulses in a quantum dot system
Full text linkWe 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.Comment: 11 pages, 5 figure
Optical properties and energy transfer in InGaAsN quantum well - InAs quantum dots tunnel injection structures for 1.3 渭m emission
No full textDefect formation in GaN grown on vicinal 4H-SiC (0001) substrates
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