Spin-Polarized Transport Through a Quantum Dot Coupled to Leads with Spin-Dependent Electron Temperature

We study the effect of a spin-dependent electron temperature detected in a recent experiment on the electronic transport through a quantum dot connected to external leads. At low temperatures, the electron occupation number on the dot and the current become fully spin-polarized even in the presence...

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Bibliographic Details
Published in:Journal of low temperature physics 2015-09, Vol.180 (5-6), p.321-329
Main Authors: Zhang, Hai-Rui, Xue, Hui-Jie, Chi, Feng
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
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Summary:We study the effect of a spin-dependent electron temperature detected in a recent experiment on the electronic transport through a quantum dot connected to external leads. At low temperatures, the electron occupation number on the dot and the current become fully spin-polarized even in the presence of a weak temperature difference between spin-up and spin-down electrons. With rising temperature, the spin information will be overwhelmed by the electrons’ thermal motion. Under an applied magnetic field, the resonances in the spin-up and spin-down currents are separated and then a 100 % spin-polarized current emerges. Now the device operates as a spin filter. It is also found that the magnitude of the current’s spin polarization can be obviously enhanced by properly adjusting the left–right asymmetry of the dot–lead coupling strengths.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-015-1315-9