Ⅰ类和Ⅱ类准周期半导体超晶格的电子子带和波函数  

ELECTRON SUBBANDS AND WAVE FUNCTIONS OF TYPE-Ⅰ AND TYPE-Ⅱ QUASIPERIODIC SEMI- CONDUCTOR SUPERLATTICES

作　　者：秦国毅[1] 

机构地区：[1]南京大学固体微结构物理实验室

出　　处：《物理学报》1989年第3期366-375,共10页Acta Physica Sinica

摘　　要：本文将包迹函数近似推广用于计算有理数近似下,垂直于超晶格轴的波矢K_⊥不等于零时,准周期半导体超晶格(QSS)的电子子带和波函数,对K_⊥=0的情形,分别计算了Ⅰ类的GaAs/Al_xGa_(1-x)As和Ⅱ类的InAs/GaSb QSS的电子子带和波函数,直至代序数m=9和6。对于价带对导带影响强的InAs/GaSb QSS,分别计算了m=5和6时电子子带随K_⊥的变化关系。并提出了利用本文结果计算Ⅰ类的GaAs/Al_xGa_(1-x)As QSS带间集体激发的具体方法。The envelope function approximation was generalized to calculate the electron subbands and wave functions of quasiperiodic semiconductor superlattices (QSS) within rational approximation, for nonzero K⊥ (the wave vector perpendicular to the axis of the QSS). For K⊥ = 0, the electron subbands and wave functions are calculated for InAs/ GaSb QSS up to the generation number m = 9 and for GaAs/AlxGa1-xAs QSS up to m = 6. For InAs/GaSb QSS, the influence of valence band states on conduction band state is strong. The dependences of the energies and band widths of electron subbands on K⊥ are obtained for m = 5 and 6. A theoretical method is proposed to calculate the intersubband collective excitations of the type-I QSS by means of the above results.

关 键 词：半导体 超晶格 电子 子带 波涵 数 

分 类 号：O471.5[理学—半导体物理]