Ac response of a coupled double quantum dot

• 来源期刊: 中国物理（英文版）
• 关键词: electronic transport electron-phonon interaction differential conductance KeldyshGreen's function
• 年，卷（期）: 2005,（10）
• 页码范围: 2093-2099
• 页数: 7页
• 语种: 英文

摘要

The effect of phase-breaking process on the ac response of a coupled double quantum dot is studied in this paper based on the nonequilibrium Green function formalism. A general expression is derived for the ac current in the presence of electron-phonon interaction. The ac conductance is numerically computed and the results are compared with those in [Anatram M P and Datts S 1995 Phys. Rev. B 51 7632]. Our results reveal that the inter-dot electron tunnelling interplays with that between dots and electron reservoirs, and contributes prominently to the ac current when inter-dot tunnelling coupling is much larger than the tunnelling coupling between dots and electron reservoirs. In addition, the phase-breaking process is found to have a significant effect on the ac transport through the coupled double dot.