Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles

Details Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles

2011-03-08

arxiv.org/abs/1103.1415v1

New Journal of Physics 13 (2011) 023032

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The dynamics of electrons in ac driven double quantum dots have been extensively analyzed by means of Floquet theory. In these systems, coherent destruction of tunneling has been shown to occur for certain ac field parameters. In the present work we analyze, by means of Floquet theory, the electron dynamics of a triple quantum dot in series attached to electric contacts, where the central dot position oscillates. In particular, we analyze the quasienergy spectrum of this ac driven nanoelectromechanical system, as a function of the intensity and frequency of the ac field and of external dc voltages. For strong driving fields, we derive, by means of perturbation theory, analytical expressions for the quasienergies of the driven oscillator system. From this analysis we discuss the conditions for coherent destruction of tunneling (CDT) to occur as a function of detuning and field parameters. For zero detuning, and from the invariance of the Floquet Hamiltonian under a generalized parity transformation, we find analytical expressions describing the symmetry properties of the Fourier components of the Floquet states under such transformation. By using these expressions, we show that in the vicinity of the CDT condition, the quasienergy spectrum exhibits exact crossings which can be characterized by the parity properties of the corresponding eigenvectors.

Affiliated with

Also associated with

No associations

Rating

Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles 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 Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quasienergy spectrum and tunneling current in ac-driven triple quantum dot shuttles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-81864