Speaker: Yan XIE
Beijing Computational Science Research Center

Abstract: Semiconductor quantum dots (QDs) have been demonstrated to be good candidates for future quantum information and quantum computation devices. Realization of conditional dynamics in QDs is the heart of those applications. By tailoring the optical and electrical properties of QDs, more interesting and useful conditional dynamics are expected. In this talk, we show a theoretical study of the photon-assisted transport (PAT) in a double quantum dot (QD) which is conditionally controlled by the optical excitation in an adjacent QD. Based on a real three-QD model, a double-electron level configuration needed for the conditional PAT is designed. Interesting conditional dynamics are demonstrated for the double QD and its adjacent QD. Depending on various conditional frequencies, the conditional behaviors can be manifested as the current peaks or collapses of the PAT. They correspond to coherent excitations or trapping of double-electron states. Our results present a possible way to optically manipulate electron states and monitor them via the signals of current spectrum.

Date&Time: April 6, 2012  14:30 - 15:30 
Location: 606 Conference Room