中国物理B ›› 2008, Vol. 17 ›› Issue (6): 2236-2239.doi: 10.1088/1674-1056/17/6/049

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The ground-state lifetime of polaron in a parabolic quantum dot

肖景林1, 于毅夫2, 尹辑文2, 王子武2   

  1. (1)College of Physics and Electronic Information Inner Mongolia National University, Tongliao 028043, China; (2)Department of Physic and Electronic Information Engineering, Chifeng College, Chifeng 024000, China
  • 收稿日期:2007-10-30 修回日期:2007-11-20 出版日期:2008-06-20 发布日期:2008-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10747002 and 10347004).

The ground-state lifetime of polaron in a parabolic quantum dot

Yu Yi-Fu(于毅夫)a), Xiao Jing-Lin(肖景林)b), Yin Ji-Wen(尹辑文)a), and Wang Zi-Wu(王子武)a)†   

  1. a Department of Physic and Electronic Information Engineering, Chifeng College, Chifeng 024000, China; b College of Physics and Electronic Information Inner Mongolia National University, Tongliao 028043, China
  • Received:2007-10-30 Revised:2007-11-20 Online:2008-06-20 Published:2008-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10747002 and 10347004).

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摘要： This paper reports that the ground-state energy of polaron was obtained with strong electron-LO-phonon coupling by using a variational method of the Pekar type in a parabolic quantum dot. Quantum transition is occurred in the quantum system due to the electron--phonon interaction and the influence of temperature. That is the polaron transit from the ground-state to the first-excited state after absorbing a LO-phonon and it causes the change of the polaron lifetime. Numerical calculations are performed and the results illustrate that the ground-state lifetime of the polaron will increase with increasing the ground-state energy of polaron and decrease with increasing the electron-LO-phonon coupling strength, the confinement length of the quantum dot and the temperature.

关键词: quantum dot, polaron, lifetime

Abstract: This paper reports that the ground-state energy of polaron was obtained with strong electron-LO-phonon coupling by using a variational method of the Pekar type in a parabolic quantum dot. Quantum transition is occurred in the quantum system due to the electron--phonon interaction and the influence of temperature. That is the polaron transit from the ground-state to the first-excited state after absorbing a LO-phonon and it causes the change of the polaron lifetime. Numerical calculations are performed and the results illustrate that the ground-state lifetime of the polaron will increase with increasing the ground-state energy of polaron and decrease with increasing the electron-LO-phonon coupling strength, the confinement length of the quantum dot and the temperature.

Key words: quantum dot, polaron, lifetime

中图分类号:  (Polarons and electron-phonon interactions)

  • 71.38.-k
73.21.La (Quantum dots)