声子色散对量子点中弱耦合极化子光学声子平均数的影响

J4 ›› 2016, Vol. 33 ›› Issue (1): 106-110.

声子色散对量子点中弱耦合极化子光学声子平均数的影响

杨洪涛,冀文慧,冯有良,胡文弢

集宁师范学院物理系，内蒙古乌兰察布 012000

收稿日期:2015-09-16 修回日期:2015-10-22 出版日期:2016-01-28 发布日期:2016-01-06
通讯作者: 杨洪涛（1980—），女，内蒙古通辽市人，讲师，主要从事凝聚态光学性质方面的研究． E-mail:yanghongtao_2000@aliyun.com
基金资助:
内蒙古自治区高等学校科学研究项目（NJZY12248）；集宁师范学院科学研究项目（jsky2015044）

Influence of phonon dispersion on average optical phonon number of weak-coupling polaron in a parabolic quantum dot

YANG Hongtao, JI Wenhui, FENG Youliang, HU Wentao

Department of Physics, Jining Normal University, Wulanchabu 012000, China

Received:2015-09-16 Revised:2015-10-22 Published:2016-01-28 Online:2016-01-06

摘要/Abstract

摘要：

采用幺正变换和线性组合算符相结合的方法，研究声子色散对抛物量子点中弱耦合极化子电子周围光学声子平均数的影响。计及纵光学（LO）声子抛物色散，导出了量子点中极化子的基态能量和电子周围光学声子平均数随声子色散系数的变化关系。数值计算结果表明基态能量随声子色散系数的增大而减小，电子周围光学声子平均数随声子色散系数的增大而增大。

关键词: 光电子学；抛物量子点；线性组合算符；极化子；声子色散

Abstract:

The influence of phonons dispersion on the properties of the average optical phonon number of weak-coupling polaron in a parabolic quantum dot is studied by using the linear-combination operator and unitary transformation method. Taking account of the longitudinal optical (LO) phonons dispersion in a parabolic approximation, the ground state energy and the average number of virtual phonons around the electron as a function of the coefficient of the phonon dispersion are obtained. Numerical calculation results show that the ground state energy decreases with increasing the coefficient of the phonon dispersion, the average number of virtual phonons around the electron increases with increasing the coefficient of phonon dispersion.

Key words: optoelectronics; parabolic quantum dot; linear combination operator; polaron; phonon dispersion

中图分类号:

O469

杨洪涛冀文慧冯有良胡文弢. 声子色散对量子点中弱耦合极化子光学声子平均数的影响[J]. J4, 2016, 33(1): 106-110.

YANG Hongtao, JI Wenhui, FENG Youliang, HU Wentao. Influence of phonon dispersion on average optical phonon number of weak-coupling polaron in a parabolic quantum dot[J]. J4, 2016, 33(1): 106-110.

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