Abstract
We have studied the electron transport through a quantum dot coupled to three leads in the presence of external microwave fields supplied to different parts of the considered mesoscopic system. Additionally, we introduced a possible nonresonant tunneling channel between leads. The quantum dot charge and currents were determined in terms of the appropriate evolution operator matrix elements and under the wide-band limit the analytical formulas for time-averaged currents and differential conductance were obtained. We have also examined the response of the considered system on the rectangular-pulse modulation imposed on different quantum dot-lead barriers as well as the time dependence of currents flowing in response to suddenly removed (or included) connection of a quantum dot with one of the leads.
5 More- Received 2 March 2005
DOI:https://doi.org/10.1103/PhysRevB.72.125312
©2005 American Physical Society