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)†
aDepartment of Physic and Electronic Information Engineering, Chifeng College, Chifeng 024000, China; bCollege of Physics and Electronic Information Inner Mongolia National University, Tongliao 028043, China
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.
Received: 30 October 2007
Revised: 20 November 2007
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10747002 and
10347004).
Cite this article:
Yu Yi-Fu(于毅夫), Xiao Jing-Lin(肖景林), Yin Ji-Wen(尹辑文), and Wang Zi-Wu(王子武) The ground-state lifetime of polaron in a parabolic quantum dot 2008 Chin. Phys. B 17 2236
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