有限深势阱里量子盘中的束缚极化子  

THE PROPERTIES OF GROUND STATE OF POLARON IN QUANTUM DISK IN FINITE DEPTH POTENTIAL WELL

作　　者：赵翠兰[1] 王丽丽[1] 赵丽丽[2] 

机构地区：[1]内蒙古民族大学物理与电子信息学院,内蒙古通辽市028043 [2]赤峰学院计算机与信息工程学院,内蒙古赤峰市024000

出　　处：《低温物理学报》2013年第2期151-154,共4页Low Temperature Physical Letters

摘　　要：采用平面波展开、幺正变换和变分相结合的方法研究有限深势阱里量子盘中束缚极化子的性质.数值计算结果表明束缚极化子的基态能量随势垒高度和势垒宽度的增大而增大,原因是势垒愈高、愈宽,电子穿透势垒的可能性愈小,导致电子能量增大,进而导致极化子基态能量增大.数值计算结果还表明束缚极化子的基态能量随量子盘有效受限长度和量子盘半径的增大而减小;声子效应导致极化子能量较电子能量低.库仑势导致极化子能量低于相应束缚极化子能量.The properties of bound polaron in quantum disk in finite depth potential well is studied by expanding the potential function as plane waves, LLP unitary transformation and variation method. Numerical results indicate that ground state energy of bound polaron increases with increasing the width or height of the finite depth potential well, because probability of electron penetrating potential barrier of finite depth potential well will decrease when the width or height of potential barrier increases, so that electronic energy and energy of bound polaron increase. Oppo- sitely, ground state energy of bound polaron decreases with increasing effective confine length and radius of quantum disk, because the more effective confine length is, the weaker electron is bounded and the smaller potential energy is, so that energy of bound polaron decreases. The phonon effect leads to ground state energy of polaron lower than electronic ground state energy. The Coulomb potential leads to ground state enrgy of bound polaron lower than ground state energy of polaror~

关 键 词：束缚极化子 量子盘 声子效应 有限深势阱 

分 类 号：O471.1[理学—半导体物理]