Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system

Details Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system

2011-01-30

arxiv.org/abs/1101.5751v4

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages, 9 figures. Revised argument, results unchanged, added references

Scientific paper

The charge transport of a serially coupled quantum dots (SCQD) connected to the metallic electrodes is theoretically investigated in the Coulomb blockade regime. A closed-form expression for the tunneling current of SCQD in the {\color{red} weak interdot hopping} limit is obtained by solving an extended two-site Hubbard model via the Green's function method. We use this expression to investigate spin current rectification, negative differential conductance, and coherent tunneling in the nonlinear response regime. The current rectification arising from the space symmetry breaking of SCQD is suppressed by increasing temperature. The calculation of SCQD is extended to the case of multiple parallel SCQDs for studying the charge ratchet effect and SCQD with multiple levels. In the linear response regime, the functionalities of spin filter and low-temperature current filter are demonstrated to coexist in this system. It is further demonstrated that two-electron spin singlet and triplet states can be readily resolved from the measurement of Seebeck coefficient rather than that of electrical conductance.

Affiliated with

Also associated with

No associations

Rating

Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Theory of spin blockade, charge ratchet effect, and thermoelectrical behavior in serially coupled quantum-dot system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-157741