Rashba效应下量子点中束缚极化子的有效质量

J4 ›› 2013, Vol. 30 ›› Issue (3): 367-372.

Rashba效应下量子点中束缚极化子的有效质量

赵翠兰¹,戈君²

1 内蒙古民族大学物理与电子信息学院，内蒙古通辽，028043; 2 呼伦贝尔学院物理与电子信息学院，内蒙古呼伦贝尔，021008

收稿日期:2012-05-29 修回日期:2012-07-05 出版日期:2013-05-28 发布日期:2013-05-06
通讯作者: 赵翠兰（1962—），女，教授，硕士，从事凝聚态光学性质和固态量子信息学研究。 E-mail:nmdzcl@163.com
基金资助:
国家自然科学基金(10964005) 、内蒙古高等学校科研基金(NJzy08085)

Effective mass of bound polaron in quantum dot influenced by the Rashba effect

ZHAO Cui-Lan, GE Jun

1 College of Physics and Electronic Information, Inner Mongolia University for Nationalities, Tongliao 028043, China; 2 College of Physics and Electronic Information, Inner Mongolia Hulunbei’er College, Hulunbei’er 021008, China

Received:2012-05-29 Revised:2012-07-05 Published:2013-05-28 Online:2013-05-06

摘要/Abstract

摘要： 采用线性组合算符、LLP幺正变换和变分方法，研究Rashba效应下量子点中强耦合束缚极化子有效质量的性质。对RbCl量子点数值计算的结果表明：极化子的振动频率、有效质量均随极化子速率、受限强度和库仑束缚势的增大而增大，原因是极化子速率增大电子动能增加，库仑束缚势增大导致电子-声子间相互作用增强，受限强度增大使电子运动的有效范围减小导致电子能量增大，进而使极化子的振动频率和有效质量增大。受Rashba自旋轨道相互作用的影响，极化子的有效质量发生劈裂，劈裂间距随极化子速率的增大而减小。

关键词: 光电子学, 有效质量, 线性组合算符方法, 束缚极化子, Rashba效应, 量子点

Abstract: The effective mass of bound polaron with strong-coupling between electron and phonon and considering the influence of Rashba effect, which was brought by the spin-orbit interaction , was expressed as a function of Rashba effect ，speed and vibration frequency of polaron by using improved linear combination operator ，LLP unitary transformation and variation methods. The numerical calculation results for RbCl quantum dot indicate that the effective mass and vibration frequency of bound polaron increase with increasing speed and confinement strength of polaron as well as Coulomb bound potential，because of increasing of electronic kinetic energy with increasing polaron speed, enhancing interaction between electron and phonons with strengthening Coulomb bound potential, reducing effective range of electronic motion and increasing electronic kinetic energy with increasing confinement strength of polaron. The numerical calculation results also show effective mass of bound poalron is split because of Rashba spin-orbit interaction , the splitting difference of effective mass decreases with increasing speed of polaron.

Key words: optoelectronics, effective mass, linear combination operator method, bound polaron, Rashba effect, quantum dot

中图分类号:

O469

赵翠兰戈君. Rashba效应下量子点中束缚极化子的有效质量[J]. J4, 2013, 30(3): 367-372.

ZHAO Cui-Lan, GE Jun. Effective mass of bound polaron in quantum dot influenced by the Rashba effect [J]. J4, 2013, 30(3): 367-372.

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