应变纤锌矿GaN/Al_xGa_(1-x)N柱形量子点中子带光吸收及其压力效应  

Intersubband Optical Absorption in a Strained Wurtzite GaN/Al_xGa_(1-x)N Cylindrical Quantum Dot and Its Hydrostatic Pressure Effect

作　　者：石卫燕 闫祖威[1] 石磊[1] 

机构地区：[1]内蒙古农业大学理学院,呼和浩特010018

出　　处：《内蒙古大学学报（自然科学版）》2015年第2期148-155,共8页Journal of Inner Mongolia University：Natural Science Edition

基　　金：国家自然科学基金资助项目(11364028);内蒙古自然科学基金重大项目(2013ZD02)资助;内蒙古"草原英才"工程资助项目

摘　　要：在有效质量近似下,研究了应变纤锌矿GaN/AlxGa1-xN柱形量子点中基态与第一激发态波函数、能级和导带内的子带光吸收及其压力效应,数值计算了光吸收系数随量子点尺寸、组分和光照强度的变化,讨论了流体静压力对光吸收的影响.结果表明:随着量子点尺寸的减小和组分的增加子带跃迁吸收峰升高且发生蓝移;GaN/AlxGa1-xN量子点子带跃迁产生的吸收峰值会随流体静压力的减小而增加且发生红移.With the effective mass approximation,intersubband optical absorption in a strained wurtzite GaN/AlxGa1-xN cylindrical quantum dot influenced by hydrostatic pressure is studied.The wave function and energy level are obtained by separation variable method.Light absorption coefficients varying with the quantum dot size,composition and light density changes are culculated.The hydrostatic pressure effect on light absorption is studied.The results indicate that the peak absorption coefficients increase with the increase of Al composition and decrease of the size and occur a blue-shift.The peak absorption coefficients increase with the decrease of hydrostatic pressure and occur a red-shift.

关 键 词：柱形量子点 子带光吸收 流体静压力 

分 类 号：O471.3[理学—半导体物理]