Spin filtering through excited states in double quantum dot pumps

Details Spin filtering through excited states in double quantum dot pumps Spin filtering through excited states in double quantum dot pumps

2006-06-14

arxiv.org/abs/cond-mat/0606362v2

Phys. Rev. B 74, 035326 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages. 5 figures

Scientific paper

10.1103/PhysRevB.74.035326

Recently it has been shown that ac-driven double quantum dots can act as spin pumps and spin filters. By calculating the current through the system for each spin polarization, by means of the time evolution of the reduced density matrix in the sequential tunneling regime (Born-Markov approximation), we demonstrate that the spin polarization of the current can be controlled by tuning the parameters (amplitude and frequency) of the ac field. Importantly, the pumped current as a function of the applied frequency presents a series of peaks which are uniquely associated with a definite spin polarization. We discuss how excited states participating in the current allow the system to behave as a bipolar spin filter by tuning the ac frequency and intensity. We also discuss spin relaxation and decoherence effects in the pumped current and show that measuring the width of the current vs frequency peaks allows to determine the spin decoherence time $T_{2}$.

Affiliated with

Also associated with

No associations

Rating

Spin filtering through excited states in double quantum dot pumps 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 Spin filtering through excited states in double quantum dot pumps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin filtering through excited states in double quantum dot pumps will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-196786