Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-11-02
Phys. Rev. B. 80, 165333 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 13 figures
Scientific paper
Spin-dependent transport through two coupled single-level quantum dots weakly connected to ferromagnetic leads with collinear magnetizations is considered theoretically. Transport characteristics, including the current, linear and nonlinear conductance, and tunnel magnetoresistance are calculated using the real-time diagrammatic technique in the parallel, serial, and intermediate geometries. The effects due to virtual tunneling processes between the two dots via the leads, associated with off-diagonal coupling matrix elements, are also considered. Negative differential conductance and negative tunnel magnetoresistance have been found in the case of serial and intermediate geometries, while no such behavior has been observed for double quantum dots coupled in parallel. It is also shown that transport characteristics strongly depend on the magnitude of the off-diagonal coupling matrix elements.
Barnas Jozef
Trocha Piotr
Weymann Ireneusz
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