Spin-Resolved Purcell Effect in a Quantum Dot Microcavity System
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- 作者：Qijun Ren ; Jian Lu ; H. H. Tan ; Shan Wu ; Liaoxin Sun ; Weihang Zhou ; Wei Xie ; Zheng Sun ; Yongyuan Zhu ; C. Jagadish ; S. C. Shen ; Zhanghai Chen
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：July 11, 2012
- 年：2012
- 卷：12
- 期：7
- 页码：3455-3459
- 全文大小：345K
- 年卷期：v.12,no.7(July 11, 2012)
- ISSN：1530-6992
文摘
We demonstrate the spin selective coupling of the exciton state with cavity mode in a single quantum dot (QD)鈥搈icropillar cavity system. By tuning an external magnetic field, each spin polarized exciton state can be selectively coupled with the cavity mode due to the Zeeman effect. A significant enhancement of spontaneous emission rate of each spin state is achieved, giving rise to a tunable circular polarization degree from 鈭?0% to 93%. A four-level rate equation model is developed, and it agrees well with our experimental data. In addition, the coupling between photon mode and each exciton spin state is also achieved by varying temperature, demonstrating the full manipulation over the spin states in the QD-cavity system. Our results pave the way for the realization of future quantum light sources and the quantum information processing applications.