Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-03-09
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
9 pages, 10 figures
Scientific paper
10.1103/PhysRevB.71.235320
With the help of the Green function technique and the equation of motion approach, the electronic transport through a parallel-coupled double quantum dot(DQD) is theoretically studied. Owing to the inter-dot coupling, the bonding and antibonding states of the artificial quantum-dot-molecule may constitute an appropriate basis set. Based on this picture, the Fano interference in the conductance spectra of the DQD system is readily explained. The possibility of manipulating the Fano lineshape in the tunnelling spectra of the DQD system is explored by tuning the dot-lead coupling, the inter-dot coupling, the magnetic flux threading the ring connecting dots and leads, and the flux difference between two sub-rings. It has been found that by making use of various tuning, the direction of the asymmetric tail of Fano lineshape may be flipped by external fields, and the continuous conductance spectra may be magnetically manipulated with lineshape retained. More importantly, by adjusting the magnetic flux, the function of two molecular states can be exchanged, giving rise to a swap effect, which might play a role as a qubit in the quantum computation.
Lu Haizhou
Lu Rong
Zhu Bang-fen
No associations
LandOfFree
Tunable Fano effect in parallel-coupled double 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 Tunable Fano effect in parallel-coupled double quantum dot system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tunable Fano effect in parallel-coupled double quantum dot system will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-369317