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Chin. Phys. B, 2008, Vol. 17(6): 2236-2239    DOI: 10.1088/1674-1056/17/6/049
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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)
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
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.
Keywords:  quantum dot      polaron      lifetime  
Received:  30 October 2007      Revised:  20 November 2007      Accepted manuscript online: 
PACS:  71.38.-k (Polarons and electron-phonon interactions)  
  73.21.La (Quantum dots)  
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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