Quantum plane Confinement effect of Exciton as an example of Boson Confinement

激子的量子平面限制效应作为玻色子限制的例子

• 批准号: 06452049
• 负责人: SEGAWA Yusaburo
• 金额: $ 4.35万
• 依托单位: THE INSTITUTE OF PHYSICAL AND CHEMICAL RESEARCH
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452049/
• 关键词: Exciton; Quantization; Confinement; CuCl; Optical Spectrum; Epitaxial; Thin Film

A study of quantized excitons in CuCl epitaxial thin films is reported. Film thickness (L) that are much smaller than the photon wavelength (lambda) is the medium (-160nm), but larger than the exciton Bohr radius a_B (-0.7nm), are considered here. Many structures have been observed in transmission and absorption spectra over the Z_3 exciton region. When L<30nm, these structures correspond well to the confined exciton levels with odd quantum number n. The oscillator strength for the nth quantized exciton is found to be proportional to L/n^2 for odd n and zero for even n. The absence of the states with even n in the optical spectra is interpreted in terms of the parity selection rule in the confined exciton system when the long-wavelength approximation holds. The measured optical spectra are compared with the additional-boundary condition-free response theory. Polariton-interference fringes given by the theory demonstrate a good agreement with the experimental results both for thick and thin films. By analyzing the absorption line shape, the dependence of nonradiative damping of the quantized exciton on quantum number n and film thickness L is discussed.

报道了CuCl外延薄膜中激子的量子化研究。这里考虑的薄膜厚度（L）远小于介质中的光子波长（λ）（-160 nm），但大于激子波尔半径a_B（-0.7 nm）。在Z_3激子区的透射谱和吸收谱中观察到许多结构。当L<30 nm时，这些结构与奇量子数n的受限激子能级有很好的对应。我们发现，第n个量子化激子的振子强度与L/n^2成正比（对于奇数n），与L/n^2成正比（对于偶数n）。当长波长近似成立时，在受限激子系统中，根据宇称选择规则解释了光谱中没有偶数n态的现象。测量的光谱与附加边界条件的自由响应理论进行了比较。理论给出的极化子干涉条纹与实验结果符合得很好。通过对吸收线形状的分析，讨论了量子化激子的无辐射阻尼与量子数n和膜厚L的关系。

项目成果

Z.K.Tang: "New optical selection rule in confined exciton system in ultrathin CuCl films" RIKEN Review. 11. 19-20 (1995)

Z.K.Tang：“超薄 CuCl 薄膜中受限激子系统的新光学选择规则”RIKEN Review。

Shintaro Nomura: "Magnetic field Effects in Direct-and Indirect-Gap Semiconductor Quantum Dots." Jpn. J. Appl. phys.34. 125-127 (1995)

Shintaro Nomura：“直接和间接带隙半导体量子点中的磁场效应。”

Z.K.Tang: "Nonradiative damping of quantized exciton in ultrathin CuCl films." Journal of Luminescence. 60 and 61. 316-319 (1994)

Z.K.Tang：“超薄 CuCl 薄膜中量子化激子的非辐射阻尼。”

Akihisa Yanase: "Two different in-plane orientaions in the growth of cuprous halides on MgO(001)." Surface Science. 329. 219-226 (1995)

Akihisa Yanase：“卤化亚铜在 MgO(001) 上生长的两种不同的面内取向。”

Akihisa Yanase: "Heteroepitaxial growth of ionic compounds between dissimilar crystal lattice." RIKEN Review. 11. 17-18 (1995)

Akihisa Yanase：“不同晶格之间离子化合物的异质外延生长。”