Spin-resolved purcell effect in a quantum dot microcavity system

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

doi:10.1021/nl3008083

Spin-resolved purcell effect in a quantum dot microcavity system

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

We demonstrate the spin selective coupling of the exciton state with cavity mode in a single quantum dot (QD)-micropillar 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 -90% 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.

Original language	English
Pages (from-to)	3455-3459
Number of pages	5
Journal	Nano Letters
Volume	12
Issue number	7
DOIs	https://doi.org/10.1021/nl3008083
Publication status	Published - 11 Jul 2012

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title = "Spin-resolved purcell effect in a quantum dot microcavity system",

abstract = "We demonstrate the spin selective coupling of the exciton state with cavity mode in a single quantum dot (QD)-micropillar 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 -90% 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.",

keywords = "Purcell effect, Quantum dots, cavity quantum electrodynamics, photonic structures, spin polarization",

author = "Qijun Ren and Jian Lu and Tan, {H. H.} and Shan Wu and Liaoxin Sun and Weihang Zhou and Wei Xie and Zheng Sun and Yongyuan Zhu and C. Jagadish and Shen, {S. C.} and Zhanghai Chen",

year = "2012",

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doi = "10.1021/nl3008083",

language = "English",

volume = "12",

pages = "3455--3459",

journal = "Nano Letters",

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TY - JOUR

T1 - Spin-resolved purcell effect in a quantum dot microcavity system

AU - Ren, Qijun

AU - Lu, Jian

AU - Tan, H. H.

AU - Wu, Shan

AU - Sun, Liaoxin

AU - Zhou, Weihang

AU - Xie, Wei

AU - Sun, Zheng

AU - Zhu, Yongyuan

AU - Jagadish, C.

AU - Shen, S. C.

AU - Chen, Zhanghai

PY - 2012/7/11

Y1 - 2012/7/11

N2 - We demonstrate the spin selective coupling of the exciton state with cavity mode in a single quantum dot (QD)-micropillar 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 -90% 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.

AB - We demonstrate the spin selective coupling of the exciton state with cavity mode in a single quantum dot (QD)-micropillar 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 -90% 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.

KW - Purcell effect

KW - Quantum dots

KW - cavity quantum electrodynamics

KW - photonic structures

KW - spin polarization

UR - http://www.scopus.com/inward/record.url?scp=84863845789&partnerID=8YFLogxK

U2 - 10.1021/nl3008083

DO - 10.1021/nl3008083

M3 - Article

SN - 1530-6984

VL - 12

SP - 3455

EP - 3459

JO - Nano Letters

JF - Nano Letters

IS - 7

ER -

Spin-resolved purcell effect in a quantum dot microcavity system

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