Experimental determination of excitonic dispersion relation from center-of-mass quantization effect on excitons in PbI2 thin films
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- Oohata Goro
- Department of Applied Physics, Graduate School of Engineering, Osaka City University
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- Yokotsuji Yuta
- Department of Applied Physics, Graduate School of Engineering, Osaka City University
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- Kim DaeGwi
- Department of Applied Physics, Graduate School of Engineering, Osaka City University
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- Ishihara Hajime
- Department of Physics and Electronics, Graduate School of Engineering, Osaka Prefecture University CREST, Japan Science and Technology Agency
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- Nakayama Masaaki
- Department of Applied Physics, Graduate School of Engineering, Osaka City University
書誌事項
- タイトル別名
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- Experimental Determination of Excitonic Dispersion Relation from Center-of-Mass Quantization Effect on Excitons in PbI<SUB>2</SUB> Thin Films
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説明
We have investigated the center-of-mass quantization effect on excitons in layered-compound PbI2 ultra-thin films by precisely changing the layer thickness from 7 to 20 monolayers. Crystalline PbI2 thin films that are fully oriented along the c-axis were prepared by a vacuum deposition method. We confirmed that the surface roughness of the prepared thin films corresponds to one monolayer owing to the van der Waals interaction along the c-axis peculiar to the layered compound, which is advantageous for the realization of the center-of-mass quantization effect. The optical spectra, such as absorption, transmittance, and reflectance clearly exhibit oscillatory structures originating from the quantized excitonic states with a quantum number of up to 15: the quantization energy amounts to ∼130 meV. From the analysis of the systematic results of the center-of-mass quantization, we experimentally determined the excitonic dispersion relation of PbI2, which is well explained by a tight-binding exciton model instead of a usually used effective-mass model.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 78 (2), 024702-024702, 2009
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390001204196264448
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- NII論文ID
- 130005437277
- 110007097876
- 210000107669
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- NII書誌ID
- AA00704814
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 9800320
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可