Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-04-18
Physical Review B 84, 115322 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Published version. 9 pages, 9 figures
Scientific paper
10.1103/PhysRevB.84.115322
We investigate real-time dynamics of spin-polarized current in a quantum dot coupled to ferromagnetic leads in both parallel and antiparallel alignments. While an external bias voltage is taken constant in time, a gate terminal, capacitively coupled to the quantum dot, introduces a periodic modulation of the dot level. Using non equilibrium Green's function technique we find that spin polarized electrons can tunnel through the system via additional photon-assisted transmission channels. Owing to a Zeeman splitting of the dot level, it is possible to select a particular spin component to be photon-transfered from the left to the right terminal, with spin dependent current peaks arising at different gate frequencies. The ferromagnetic electrodes enhance or suppress the spin transport depending upon the leads magnetization alignment. The tunnel magnetoresistance also attains negative values due to a photon-assisted inversion of the spin-valve effect.
Carrara Thiago L.
Souza Fabricio M.
Vernek Edson
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