›› 2014, Vol. 23 ›› Issue (9): 94205-094205.doi: 10.1088/1674-1056/23/9/094205

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

Influence of a phonon bath in a quantum dot cavity QED system：Dependence of the shape

王伟胜, 张明亮, 陈芝得   

  1. Department of Electronic Engineering, Jinan University, Guangzhou 510632, China
  • 收稿日期:2014-01-15 修回日期:2014-02-23 出版日期:2014-09-15 发布日期:2014-09-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10974072).

Influence of a phonon bath in a quantum dot cavity QED system：Dependence of the shape

Wang Wei-Sheng (王伟胜), Zhang Ming-Liang (张明亮), Chen Zhi-De (陈芝得)   

  1. Department of Electronic Engineering, Jinan University, Guangzhou 510632, China
  • Received:2014-01-15 Revised:2014-02-23 Online:2014-09-15 Published:2014-09-15
  • Contact: Chen Zhi-De E-mail:tzhidech@jnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10974072).

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摘要： We present a systematic analysis on the role of the quantum dot (QD) shape in the influence of the phonon bath on the dynamics of a QD cavity QED system. The spectral functions of the phonon bath in three representative QD shapes: spherical, ellipsoidal, and disk, are calculated from the carrier wave functions subjected to the confinement potential provided by the corresponding shape. The obtained spectral functions are used to calculate three main effects brought by the phonon bath, i.e., the coupling renormalization, the off-resonance assisted feeding rate and the pure dephasing rate. It is found that the spectral function of a disk QD has the widest distribution, hence the phonon bath in a disk QD can lead to the smallest renormalization factor, the largest dephasing rate in the short time domains(≤ 2 ps), and the off-resonance assisted feeding can support the widest detuning. Except for the pure dephasing rate in the long time domains, all the influences brought by the phonon bath show serious shape dependence.

关键词: quantum dot, shape dependence, phonon bath, spectral function

Abstract: We present a systematic analysis on the role of the quantum dot (QD) shape in the influence of the phonon bath on the dynamics of a QD cavity QED system. The spectral functions of the phonon bath in three representative QD shapes: spherical, ellipsoidal, and disk, are calculated from the carrier wave functions subjected to the confinement potential provided by the corresponding shape. The obtained spectral functions are used to calculate three main effects brought by the phonon bath, i.e., the coupling renormalization, the off-resonance assisted feeding rate and the pure dephasing rate. It is found that the spectral function of a disk QD has the widest distribution, hence the phonon bath in a disk QD can lead to the smallest renormalization factor, the largest dephasing rate in the short time domains(≤ 2 ps), and the off-resonance assisted feeding can support the widest detuning. Except for the pure dephasing rate in the long time domains, all the influences brought by the phonon bath show serious shape dependence.

Key words: quantum dot, shape dependence, phonon bath, spectral function

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

  • 42.50.Pq
78.67.Hc (Quantum dots) 63.20.kd (Phonon-electron interactions) 63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)