Transient regime in non-linear transport through many-level quantum dots

Details Transient regime in non-linear transport through many-level quantum dots Transient regime in non-linear transport through many-level quantum dots

2007-03-07

arxiv.org/abs/cond-mat/0703179v1

PRB 76, 085330 (2007).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX, 12 pages, 11 include .eps figures

Scientific paper

10.1103/PhysRevB.76.085330

We investigate the nonstationary electronic transport in noninteracting nanostructures driven by a finite bias and time-dependent signals applied at their contacts to the leads. The systems are modelled by a tight-binding Hamiltonian and the transient currents are computed from the non-equilibrium Green-Keldysh formalism. The numerical implementation is not restricted to weak coupling to the leads and does not imply the wide-band limit assumption for the spectral width of the leads. As an application of the method we study in detail the transient behavior and the charge dynamics in single and double quantum dots connected to leads by a step-like potential, but the method allows as well the consideration of non-periodic potentials or short pulses. We show that when the higher energy levels of the isolated system are located within the bias window of the leads the transient current approaches the steady state in a non-oscillatory smooth fashion. At moderate coupling to the leads and fixed bias the transient acquires a step-like structure, the length of the steps increasing with the system size. The number of levels inside a finite bias window can be tuned by a constant gate potential. We find also that the transient behavior depends on the specific way of coupling the leads to the mesoscopic system.

Affiliated with

Also associated with

No associations

Rating

Transient regime in non-linear transport through many-level quantum dots 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 Transient regime in non-linear transport through many-level quantum dots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transient regime in non-linear transport through many-level quantum dots will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-254523