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Influence of temperature and LO phonon on the effective mass of bipolarons in polar semiconductor quantum dots

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Abstract

The temperature and LO phonon effects of the bipolaron in polar semiconductor quantum dots (QDs) are studied by using the Tokuda modified linear-combination operator method and the Lee-Low-Pines variational method. The expressions for the mean number of LO phonons and the effective mass of the bipolaron are derived. Numerical results show that the mean number of LO phonons of the bipolaron decreases with increasing the temperature and the relative distance r between two electrons, but increases with increasing the electron-phonon coupling strength α. The effective mass of the bipolaron M* increases rapidly with increasing the relative distance r between two electrons when r is smaller, and it reaches a maximum at r≈4.05rp, while after that, M* decreases slowly with increasing r. The effective mass of the bipolaron M* decreases with increasing the temperature. The electron-phonon coupling strength α markedly influences the changes of mean number of LO phonons and the effective mass M* with the relative distance γ and the temperature parameter γ .

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DOI:10.1007/s11801-012-2285-7

基金项目:This work has been supported by the Science and Technology Development Plan of Qinhuangdao (No.201101A027).

收稿日期:2012-06-08

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XIN Wei:Institute of Condensed Matter Physics, Hebei Normal University of Science & Technology, Qinhuangdao 066004, China
GAO Zhong-ming:Institute of Condensed Matter Physics, Hebei Normal University of Science & Technology, Qinhuangdao 066004, China
HAN Chao:Institute of Condensed Matter Physics, Hebei Normal University of Science & Technology, Qinhuangdao 066004, China
Eerdunchaolu:Institute of Condensed Matter Physics, Hebei Normal University of Science & Technology, Qinhuangdao 066004, China

联系人作者:Eerdunchaolu(eerdunchaolu@163.com)

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引用该论文

XIN Wei,GAO Zhong-ming,HAN Chao,Eerdunchaolu. Influence of temperature and LO phonon on the effective mass of bipolarons in polar semiconductor quantum dots[J]. 光电子快报(英文版), 2012, 8(6): 477-480

XIN Wei,GAO Zhong-ming,HAN Chao,Eerdunchaolu. Influence of temperature and LO phonon on the effective mass of bipolarons in polar semiconductor quantum dots[J]. Optoelectronics Letters, 2012, 8(6): 477-480

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