Photon-assisted electronic structure and transport for a quantum dot

• 来源期刊: 中国物理（英文版）
• 关键词: quantum dot laser field density of states nonequilibrium Green functions
• 年，卷（期）: 2007,（7）
• 页码范围: 2106-2110
• 页数: 5页
• 语种: 英文

摘要

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.