【摘要】 本文用自治的线性响应理论,在类似于紧束缚近似的条件下计算了非扁平子带间的集体激发谱.结果是不仅文献[3]导出的无重叠模式有显著的修正,而且出现了两支纯由层间波函数的重叠效应引起的新模式. 本文的方法可直接用于带内激发和存在垂直磁场时磁等离子激发的研究,并为建立半导体超晶格内非扁平子带间的光吸收理论以及鞍点激子理论奠定了基础.更多还原

【Abstract】 The self-consistent linear response theory and tight-binding approximation areused to calculate the intersubband collective excitations between non-flat subbands. The results show that the non-overlaping mode obtained in referenee [3] is obvious-ly modified,two pieces of new modes come out as a result of the overlap between thewave functions of neighbour layers. This method can be used to deal directly with the intrasubband excitations andmagnet-plasmon excitations,thus paving the way for the establishment of an improvedtheory of intersubband optical absorption and the saddlepoint excitons in semiconductorsuperlattice.更多还原