激子
量子点
电介质
玻尔半径
凝聚态物理
结合能
材料科学
玻尔模型
物理
原子物理学
纳米技术
量子力学
作者
Hui Xie,Teruya Ishihara,A. V. Nurmikko
出处
期刊:Physical review
日期:1992-03-15
卷期号:45 (12): 6961-6964
被引量:682
标识
DOI:10.1103/physrevb.45.6961
摘要
By varying the dielectric environment in new ${\mathrm{PbI}}_{4}$-based layer-type perovskite compounds, we have demonstrated directly the contribution by dielectric confinement to the exciton binding energy in three such ``natural-quantum-well'' semiconductors. With different dielectric environment, exciton binding energies of 320, 220, and 170 meV have been observed, dominated by the dielectric confinement. In terms of the conventional size-related electronic confinement, two of the materials represent monolayer ${\mathrm{PbI}}_{4}$ quantum wells while the third corresponds to a bilayer case, with a corresponding reduction in the electronic confinement. From theory, including the dielectric confinement effect, the effective mass of the exciton in a ${\mathrm{PbI}}_{4}$-based dielectric quantum well has been determined to be 0.09${\mathit{m}}_{\mathit{e}}$; the corresponding quasi-two-dimensional exciton Bohr radii were 15.5, 17.0, and 20.5 \AA{} for the three cases, respectively.
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