Theory of excess noise of a quantum dot in the presence of a microwave field
- Wang, J
- Sun, QF
- Lin, TH
Publication date
January 2000
DOI Publisher
American Physical Society (APS) ISSN
0163-1829 Journal
Physical Review BAbstract
The power spectrum of excess noise of a quantum dot coupled to two leads and irradiated by a microwave field of frequency Ω is derived exactly by directly solving the Heisenberg equation. We found that for Γ<ħΩ, where Γ is the linewidth of the intradot energy level, the power spectrum can be nonzero even if the averaged current is zero. This property originates from photon-assisted tunneling and is very different from the shot noise in steady state. For Γ≫ħΩ, our results are consistent with the recent experiment by Schoelkopf et al. and previous theory.published_or_final_versio
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