Photon-Assisted Conductance Structure for a Quantum Dot
LIAO Wen-Hu1, GAO Qin-Xiang1, ZHOU Guang-Hui2,3
1Department of Physics, Zunyi Normal College, Zunyi 563002
2Department of Physics, Hunan Normal University, Changsha 410081
3International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
Photon-Assisted Conductance Structure for a Quantum Dot
LIAO Wen-Hu1;GAO Qin-Xiang1;ZHOU Guang-Hui2,3
1Department of Physics, Zunyi Normal College, Zunyi 563002
2Department of Physics, Hunan Normal University, Changsha 410081
3International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
Abstract： We investigate theoretically the electron transport of a two-level quantum dot irradiated under a weak laser field at low temperatures in the rotating wave approximation. Using the method of the Keldysh equation of motion for nonequilibrium Green function, we examine the conductance for the system with photon polarization perpendicular to the tunnelling current direction. It is demonstrated that by analytic analysing and numerical examples, a feature of conductance peak splitting appears, and the dependence of conductance on the incident laser frequency and self-energy are discussed.
2007, Vol. 24 
