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Physics Letters A

Emission spectra from Coulomb-coupled quantum dot in the junction

Wenjing Yan, Wenfang Li, Liping Xu, Jianqiu Gong, Ting Dun Wen

Published Mar 18, 2010• 3 citations
Publisher
DOI
10.1016/j.physleta.2010.03.031

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We show that Auger processes involving wetting layer transitions mediate emission from a cavity that is detuned from a quantum dot by even tens of meV. The wetting layer thus acts as a reservoir, which by Coulomb scattering can supply or absorb the energy difference between emitter and cavity. We perform microscopic calculations of the effect treating the wetting layer as a non-Markovian reservoir interacting with the coupled quantum dot-cavity system through Coulomb interactions. Experimentally, cavity feeding has been observed in the asymmetric detuning range of -10 to +45 meV. We show that this asymmetry arises naturally from the quasiequilibrium properties of the wetting layer reservoir. Furthermore, we present numerical calculations of both photoluminescence spectra and photon correlations, demonstrating good qualitative agreement with experiments.
Abstract In this paper, the properties of emission spectra of dissipative cavities coupled with quantum dots were studied. The effects of the cavity incoherent pump rate on the emission spectra of the system are discussed. We found that the incoherent pump rate can enhance the fluorescence emission in dissipative cavities coupled with quantum dots and the result can be confirmed in experiment. In addition, the effects of the coupling strengths between quantum dot and cavity field, and between the two cavities on the emission spectra of the system also are discussed. Our results show that in the case of no matter resonance or off-resonance, the triple peaks should occur in theory when the single-mode cavity coupled with a double-level system is affected by external coherent fields and we also demonstrate that the Rabi splitting increases with the coupling strengths between quantum dot and cavity field or between the two cavities increase.