Photon-assisted electronic structure and transport for a quantum dot
Liao Wen-Hu(廖文虎)a), Gao Qin-Xiang(高钦翔)a), and Zhou Guang-Hui(周光辉)b)c)†
a Department of Physics, Zunyi Normal College, Zunyi 563002, Chinab Department of Physics, Hunan Normal University, Changsha 410081, China; cInternational Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, China
Abstract This paper investigates theoretically the electronic structure and transport of a two-level quantum dot irradiated under a strong laser field at low temperatures. Using the method of Keldysh equation of motion for nonequilibrium Green functions, it examines the time-averaged density of states and conductance for the system with photon polarization parallel with and perpendicular to the tunnelling current direction respectively. It is demonstrated that, by analysing some numerical examples, more photon sidebands resonance states and multi- and single-photon transitions are found when diagonal matrix elements dominate the interaction, while the electronic transitions due to multiphoton absorption are more or less suppressed when off-diagonal interaction dominates.
Received: 24 November 2006
Revised: 03 December 2006
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10574042) and the
Guizhou Provincial Science and Technology Foundation of China (Grant
No 20052088).
Cite this article:
Liao Wen-Hu(廖文虎), Gao Qin-Xiang(高钦翔), and Zhou Guang-Hui(周光辉) Photon-assisted electronic structure and transport for a quantum dot 2007 Chinese Physics 16 2106
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