【摘要】 本文研究了两个半无限的第Ⅰ类或第Ⅱ类半导体超晶格之间,夹以一层绝缘介质所形成的S-I-S夹层结构中,绝缘介质表面的电子集体激发谱.结果表明,不论是第Ⅰ类的或是第Ⅱ类的S-I-S结构都在很大的范围内出现声频支型的表面电子集体激发模式,而这种模式原本是不能存在于半无限的第Ⅰ类超晶格表面的.这种可以形成并传播声频支型模式的波导似的结构,具有实际应用的前景.更多还原

【Abstract】 The electronic collective modes of both Ⅰ-type and Ⅱ-type superlattice-insulator-superlattice (S-I-S) structures are studied.Several novel plasmon modes localized inthe region of the semiconductor-insulator interfaces are found.An acoustic plasma modewith a frequency below the bulk plasmon continuum occurs both in the Ⅰ-type and Ⅱ-type SIS structures but not in a simple Ⅰ-type superlattice-insulator interface.Analy-tic expressions for the dispersion relations of the plasma modes are obtained in the longwavelength limit.更多还原