自旋对量子点中束缚磁极化子性质的影响  

The Influences of Spin on the Properties of Bound Magnetopolaron in Quantum Dot

作　　者：李志新[1] 肖景林[1,2] 

机构地区：[1]河北科技师范学院数理系,河北秦皇岛066004 [2]内蒙古民族大学物理与电子信息学院,内蒙古通辽028043

出　　处：《固体电子学研究与进展》2009年第1期10-13,121,共5页Research & Progress of SSE

基　　金：河北科技师范学院博士基金资助项目(2006D001)

摘　　要：采用线性组合算符和幺正变换方法,研究了自旋对量子点中弱耦合束缚磁极化子性质的影响。考虑自旋影响时,讨论了束缚磁极化子的基态能量随量子点受限长度和磁场的变化关系。结果表明:在库仑束缚势保持不变时,磁极化子的基态能量、自旋向上(向下)分裂能都随量子点受限长度的增大而减小,随磁场的增大而增大;在磁场保持不变时,磁极化子基态能量、自旋向上(向下)分裂能都随库仑束缚势的增大而减小。The influences of spin on the properties of weak-coupling bound magnetopolaron in quantum dot have been studied by using a linear combination operator and a unitary transformation method. Considering the effects of spin, the ground state energy of bound magnetopolaron as a function of the confinement length of quantum dot and magnetic field is discussed. The results illustrate that the ground state energy, and spin-up（spin-down）splitting energy of magnetopolaron decrease with increasing the confinement length of quantum dot and increase with in- creasing the magnetic field when the Coulomb bound potential is definite; The ground state energy and spin-up （spin-down）splitting energy of magnetopolaron decrease with increasing the Coulomb bound potential when the magnetic field is definite.

关 键 词：量子点 自旋 弱耦合 束缚磁极化子 

分 类 号：O471.1[理学—半导体物理]