极化子速率对量子点中磁极化子性质的影响

J4 ›› 2011, Vol. 28 ›› Issue (1): 104-109.

极化子速率对量子点中磁极化子性质的影响

戈君王娜赵翠兰

内蒙古民族大学物理与电子信息学院，内蒙古通辽 028043

收稿日期:2010-04-15 修回日期:2010-05-27 出版日期:2011-01-28 发布日期:2011-01-14
通讯作者: 赵翠兰（1962－），女，内蒙古通辽市人，教授，研究生导师，主要从事凝聚态理论的研究。 E-mail:nmdzcl@163.com
作者简介:戈君（1980－）,内蒙古呼伦贝尔市人，研究生，主要从事凝聚态理论的研究，E-mail:robinmove@163.com。
基金资助:
内蒙古高等学校科研项目（NJZY08085）

Influence of speed of polaron on properties of magnetopolaron in quantum dots

GE Jun，WANG Na，ZHAO Cui-Lan

College of Physics and Electronic Information, Inner Mongolia University for Nationalities , Tongliao 028043, China

Received:2010-04-15 Revised:2010-05-27 Published:2011-01-28 Online:2011-01-14

摘要/Abstract

摘要：

采用改进的线性组合算符及么正变换的方法研究了极化子速率对量子点中强耦合磁极化子的性质的影响。在考虑Rashba自旋轨道耦合相互作用影响下，导出了量子点中强耦合磁极化子的振动频率、基态能量、有效质量和相互作用能随极化子速率的变化关系。对RbCl晶体进行数值计算，结果表明：量子点中强耦合磁极化子的振动频率、基态能量、有效质量随极化子速率的增加而增大，相互作用能随极化子速率的增加而减少。

关键词: 光电子学, 极化子速率, 改进的线性组合算符, 磁极化子, 量子点

Abstract:

Effects of speed of polaron on properties of a strong-coupling magneopolaron in a quantum dot are studied by using improved linear combination operator and the unitary transformation methods. Relations of the vibrational frequency, the ground state energy,the effective mass and the interaction energy of a strong-coupling magnetopolaron considering the influence of Rashba effect, which is brought by the spin-orbit interation, in the quantum dots with speed of polaron are derived. Numerical calculations for RbCl crystal are performed and the results show that the vibration frequency ,the ground state energy and the effective mass of the strong-coupling magnetopolaron in a quantum dot will increase with an increasing in the speed of the poloran , and interaction energy of the magnetopolaron decreases.

Key words: optoelectronics, speed of polaron, improved linear combination operator, magnetopolaron, quantum dot

中图分类号:

O469

戈君王娜赵翠兰. 极化子速率对量子点中磁极化子性质的影响[J]. J4, 2011, 28(1): 104-109.

GE Jun，WANG Na，ZHAO Cui-Lan. Influence of speed of polaron on properties of magnetopolaron in quantum dots[J]. J4, 2011, 28(1): 104-109.

参考文献

[1]Li SS, Chang K, Xia JB, et al .Spin-dependent transport through dilutednenhancement [J].Phys.Rev.B,2003,68：245306-245310.
[2]Chi F ，Li S S. Spin and charge currents through a quantum dot connected to ferromagnetic leas[J].Chin.Phys.Lett,2005,22:2035-2038.
[3]Manuel V-R, Antonio P, Llorenç S .Quantum dot based on spin properties of semiconductor heterostructures[J].Phys.Rev.B,2004,69:153308-153311.
[4]Liu J, Xiao J L.Zero-magnetic-field spin splitting of the polaron’s ground state energy induced by the Rashba spin-orbit interaction〔J〕.Communi Theor Phys,2006,46﹙4﹚：761-765.
[5]Wang Z W,Xiao J L.Parabolic liear bound potential quantum dot qubit and its optical phonon effect[J]Acta Physica Sinica,2007,56:678-681.
[6]Caviglia.A.D,Gabay.M,Gariglio.S, et al. Tunable Rashba Spin-orbit interaction at oxide interfaces[J] .Phys.Rev.Lett,2010,104,126803-126807.
[7]Matthias Scheid, Makoto Kohda, Yoji Kunihashi, et al. All-electrical detection of the relative strength of Rashba and Dresselhaus Spin-orbit[J] . Phys.Rev.Lett,101,266401-266405.
[8]Governale M .Quantum Dots with Rashba Spin-Orbit[J].Phys.Rev.Lett,2002,89 206802-206806.
[9]Bandyopadhyay .S.Self-assembld nanoelectronic quantum computer based on the Rashba effect in quantum dots[J].Phys.Rev.B,2000,61:13813-13820.
[10]Tsitsishvili E, Lozano G S, Gogolin A O.Rashba coupling in quantum dots:An exact solution[J].Phys.Rev.B,2004,70:115316-115327.
[11]Pekka P ,Chakraborty T.Electron correlations in a quantum dot with Bychkov-Rashba coupling[J].Phys.Rev.B,2005,71:113305-113309.
[12]Reyno A,Gonzalo U,.Sanhez M J, et al.Theory of edge states in systems with Rashba spin-orbit coupling[J]. Phys.Rev.B, 2004,70:235344-235350.
[13]Voskoboynikov O, Lee C P, Tretyak O.spin-orbit splitting in semiconductor quantum dots with a parabolic confinenment potential[J].Phys.Rev.B,2001,63:165306-165312.
[14]Hu Y G,Yin J W,Xiao J L.Average number of optical phonons of weak-coupling impurity bound magnetopolaron in a parabolic quantum dot[J].Chinee Journal of Quantum electronics,2009,26(5),636-640.
[15] Miki N, Ayaka K, Shishidou T, et al. A first-principles study on the Rashba effect in surface system〔J〕.J.phys: Condens. Matter, 2009,21:064239-064244
[16] Grimaldi C.Large polaron formation induced by Rashba spin-orbit coupling[J]. Phys.Rev.B, 2010,81:075306-075310.
[17] Kartheuser E. Dielectric Properties of Polar Crystals.Polarons in Ionic Crystals and Polar Semiconductors (M).Antwerp.Advanced Study Institute 1971 on Frohlich Polarons and Electron-Phonon Interaction in Polar Semi-Conductor (Amsterdam): North-Holland,1972 ,721.