抛物量子点中弱耦合极化子声子色散效应

J4 ›› 2015, Vol. 32 ›› Issue (2): 241-245.

抛物量子点中弱耦合极化子声子色散效应

杨洪涛,冀文慧,呼和满都拉

集宁师范学院物理系，内蒙古乌兰察布 012000

收稿日期:2014-10-27 修回日期:2014-11-20 出版日期:2015-03-28 发布日期:2015-03-17
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）

Effect of phonon dispersion on weak-coupling polaron in a parabolic quantum dot

YANG Hong-tao, JI Wen-hui, Huhemandula

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

Received:2014-10-27 Revised:2014-11-20 Published:2015-03-28 Online:2015-03-17

摘要/Abstract

摘要：

利用线性组合算符和幺正变换相结合的方法，研究了声子色散对抛物量子点中弱耦合极化子性质的影响．计及体纵光学（LO）声子抛物色散，导出了量子点中极化子的基态能量和自陷能随量子点有效受限长度、电子-纵光学声子耦合常数和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，而自陷能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, 极化子, 线性组合算符, 声子色散

Abstract:

The influence of the phonon dispersion on the properties of the weak-coupling polaron in a parabolic quantum dot was 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 self-trapping energy of the polaron in a parabolic quantum dot as a function of the effective confinement length of the quantum dot, the electron-LO-phonon coupling constant and the coefficient of the phonon dispersion were obtained. Numerical calculation results show that the ground state energy decreases with increasing the coefficient of the phonon dispersion, the self-trapping energy increases with increasing the coefficient of phonon dispersion.

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

中图分类号:

O469

杨洪涛冀文慧呼和满都拉. 抛物量子点中弱耦合极化子声子色散效应[J]. J4, 2015, 32(2): 241-245.

YANG Hong-tao, JI Wen-hui, Huhemandula. Effect of phonon dispersion on weak-coupling polaron in a parabolic quantum dot[J]. J4, 2015, 32(2): 241-245.

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