激发
量子阱
量子
物理
激子
价(化学)
统计物理学
等离子体
航程(航空)
计算物理学
数值分析
量子力学
数学
材料科学
数学分析
复合材料
激光器
出处
期刊:Physical review
日期:1995-04-15
卷期号:51 (16): 10719-10728
被引量:37
标识
DOI:10.1103/physrevb.51.10719
摘要
Excitonic nonlinearities due to plasma effects in quantum-well structures under quasistationary excitation can be reproduced by appropriate many-body treatments, which usually require numerical calculations that may become computationally intensive. An alternative approach is based on analytical approximations; however, this has not been examined carefully so far. In this paper we present the analytical calculation of the optical properties of quasi-two-dimensional, type-I semiconductor quantum wells, at varying plasma densities and accounting for one conduction band and two valence subbands. This has been developed based on the two-dimensional version of the Elliott formula and on some analytical approximations already known in part. The obtained analytical results are scalable to a considerable range of constituent materials and of quantum-well thicknesses. These results are compared with the numerical solutions achieved within a more complete many-body approach, based on the Bethe-Salpeter equation, and with experimental results obtained in a pump-probe experiment. The comparison provides general guidelines on the accuracy and on the limitations of the analytical approach applicable to the case of quasi-two-dimensional excitons when multisubband and finite-size effects are included.
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