Dicke-like effect in spin-polarized transport through coupled quantum dots

Details Dicke-like effect in spin-polarized transport through coupled quantum dots Dicke-like effect in spin-polarized transport through coupled quantum dots

2007-11-22

arxiv.org/abs/0711.3611v2

J. Phys.: Condens. Matter 20 (2008) 125220

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 5 figures

Scientific paper

10.1088/0953-8984/20/12/125220

Spin-dependent electronic transport through a quantum dot side-coupled to two quantum dots and attached to ferromagnetic leads with collinear (parallel and antiparallel) magnetizations is analyzed theoretically. The intra-dot Coulomb correlations are taken into account, whereas the inter-dot ones are neglected. Transport characteristics, i.e. conductance and tunnel magnetoresistance associated with the magnetization rotation from parallel to antiparallel configurations, are calculated by the noneqiulibrium Green function technique. The Green functions are derived by the equation of motion method in the Hartree-Fock approximation. The conductance spectra are shown to reveal features similar to the Dicke resonance in atomic physics.

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