Ac response of a coupled double quantum dot
| Autor: | Xu Jie, Zhan Shi-Chang, W. Z. Shangguan |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Physics
Ac current Condensed matter physics General Physics and Astronomy Conductance Non-equilibrium thermodynamics Astrophysics::Cosmology and Extragalactic Astrophysics Electron Paper based Double quantum Condensed Matter::Mesoscopic Systems and Quantum Hall Effect General expression Quantum tunnelling |
| Zdroj: | Chinese Physics. 14:2093-2099 |
| ISSN: | 1741-4199 1009-1963 |
| DOI: | 10.1088/1009-1963/14/10/028 |
| Popis: | 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 Datta 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. |
| Databáze: | OpenAIRE |
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