Spontaneous emission of two quantum dots in a single-mode cavity

doi:10.1088/1674-1056/22/9/094207

中国物理B ›› 2013, Vol. 22 ›› Issue (9): 94207-094207.doi: 10.1088/1674-1056/22/9/094207

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Spontaneous emission of two quantum dots in a single-mode cavity

邱柳, 张珂, 李志远

Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2013-03-01 修回日期:2013-04-02 出版日期:2013-07-26 发布日期:2013-07-26
基金资助:
Project supported by the National Basic Research Foundation of China (Grant No. 2011CB922002).

Spontaneous emission of two quantum dots in a single-mode cavity

Qiu Liu (邱柳), Zhang Ke (张珂), Li Zhi-Yuan (李志远)

Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2013-03-01 Revised:2013-04-02 Online:2013-07-26 Published:2013-07-26
Contact: Li Zhi-Yuan E-mail:lizy@aphy.iphy.ac.cn
Supported by:
Project supported by the National Basic Research Foundation of China (Grant No. 2011CB922002).

摘要/Abstract

摘要： The spontaneous emission spectrum from two quantum dots (QDs) that are strongly coupled with a single-mode nanocavity is investigated using rigorous numerical calculations and simple analytical solutions of quantum dynamics. The emission spectra both from the side and along the axis of the cavity are considered. Modification of two parameters, the coupling strength and the detuning between the transition frequencies of the two quantum dots, allows us to efficiently control the shape of the spontaneous emission spectrum. Different profiles and their physical origins can be well understood in the dressed-state picture for the light-QD interaction in the on-resonance and off-resonance situations. In the on-resonance situation, the emission spectra exhibit symmetric features, and they are not altered by the asymmetry in the coupling parameters. The axis spectra show two emission peaks while the side spectra have three emission peaks. In the off-resonance situation, the emission spectra always show an asymmetrical three-peak feature. When the two QDs have different decay parameters, singular features (a peak or a dip) can take place at the frequency of the cavity mode, and this is attributed to the unbalanced process of the emission and absorption of a single photon.

关键词: spontaneous emission, quantum dot, single-mode cavity

Abstract: The spontaneous emission spectrum from two quantum dots (QDs) that are strongly coupled with a single-mode nanocavity is investigated using rigorous numerical calculations and simple analytical solutions of quantum dynamics. The emission spectra both from the side and along the axis of the cavity are considered. Modification of two parameters, the coupling strength and the detuning between the transition frequencies of the two quantum dots, allows us to efficiently control the shape of the spontaneous emission spectrum. Different profiles and their physical origins can be well understood in the dressed-state picture for the light-QD interaction in the on-resonance and off-resonance situations. In the on-resonance situation, the emission spectra exhibit symmetric features, and they are not altered by the asymmetry in the coupling parameters. The axis spectra show two emission peaks while the side spectra have three emission peaks. In the off-resonance situation, the emission spectra always show an asymmetrical three-peak feature. When the two QDs have different decay parameters, singular features (a peak or a dip) can take place at the frequency of the cavity mode, and this is attributed to the unbalanced process of the emission and absorption of a single photon.

Key words: spontaneous emission, quantum dot, single-mode cavity

中图分类号: (Cavity quantum electrodynamics; micromasers)

42.50.Pq

03.65.Yz (Decoherence; open systems; quantum statistical methods) 78.67.Hc (Quantum dots)

邱柳, 张珂, 李志远. Spontaneous emission of two quantum dots in a single-mode cavity[J]. 中国物理B, 2013, 22(9): 94207-094207.

Qiu Liu (邱柳), Zhang Ke (张珂), Li Zhi-Yuan (李志远). Spontaneous emission of two quantum dots in a single-mode cavity[J]. Chin. Phys. B, 2013, 22(9): 94207-094207.

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Spontaneous emission of two quantum dots in a single-mode cavity

Spontaneous emission of two quantum dots in a single-mode cavity

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