Biexcitonic cavity quantum electrodynamics effect on nonlinear spectra of a quantum dot

被引:3
|
作者
Ajiki, Hiroshi [1 ]
Ishihara, Hajime [2 ]
机构
[1] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan
[2] Osaka Prefecture Univ, Dept Phys & Elect, Sakai, Osaka 5998531, Japan
基金
日本学术振兴会;
关键词
biexcitons; dressed states; Jaynes-Cummings model; quantum dots; quantum electrodynamics;
D O I
10.1063/1.3043627
中图分类号
O59 [应用物理学];
学科分类号
摘要
We theoretically study cross-polarized pump-probe spectra of a quantum dot (QD) embedded in a microcavity in the cavity quantum electrodynamics treatment. Recently, observations of a vacuum Rabi splitting for a QD in microcavity have been reported. The vacuum Rabi splitting is the level separation of one-excitation dressed states (1e states). However, two-excitation dressed states (2e states) have not been observed in this system. We discuss the possibility to observe pump-probe signal coming from the cross-polarized 2e states, in which the energy levels of a QD are modeled by a four-level system consisting of the ground state, right- and left-polarized excitons, and a biexciton. The signal peaks due to the cross-polarized 2e states are found when the quality factor of the cavity is extremely large. The spectral intensity is dramatically enhanced due to the cavity effect. The enhancement rate is independent of the coupling constants between the exciton (biexciton) and a cavity photon when a well-defined vacuum Rabi splitting is formed. However, a strong suppression of the signal occurs at a condition where the energy of the 1e state coincides with the energy difference between 1e and cross-polarized 2e states.
引用
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页数:8
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