Resonant Photon-Assisted Structure of Conductance through a Quantum Wire
LIAO Wen-Hu, ZHOU Guang-Hui
Department of Physics, Hu’nan Normal University, Changsha 410081
International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
Resonant Photon-Assisted Structure of Conductance through a Quantum Wire
LIAO Wen-Hu;ZHOU Guang-Hui
Department of Physics, Hu’nan Normal University, Changsha 410081
International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015
Abstract： We investigate theoretically the electron transport properties of a two-sublevel quantum wire irradiated by a strong laser field resonant with the quasiparticle transition at low temperatures. Using the method of the Keldysh equation of motion for nonequilibrium Green function, we examine the time-averaged conductance for the system with photon polarization parallel and perpendicular to the tunnelling current direction, respectively. We demonstrate that, by analysing some numerical examples, a feature of absolute negative conductance appears in the parallel case, while the conductance shows a symmetry distributed peaks in the perpendicular case.
2005, Vol. 22 
