Experimental determination of excitonic dispersion relation from center-of-mass quantization effect on excitons in PbI2 thin films

• Oohata Goro

  Department of Applied Physics, Graduate School of Engineering, Osaka City University

• Yokotsuji Yuta

  Department of Applied Physics, Graduate School of Engineering, Osaka City University

• Kim DaeGwi

  Department of Applied Physics, Graduate School of Engineering, Osaka City University

• Ishihara Hajime

  Department of Physics and Electronics, Graduate School of Engineering, Osaka Prefecture University CREST, Japan Science and Technology Agency

• Nakayama Masaaki

  Department of Applied Physics, Graduate School of Engineering, Osaka City University

書誌事項

タイトル別名

• Experimental Determination of Excitonic Dispersion Relation from Center-of-Mass Quantization Effect on Excitons in PbI<SUB>2</SUB> Thin Films

抄録

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

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 78 (2), 024702-024702, 2009

  一般社団法人 日本物理学会

キーワード

• exciton
• PbI<SUB>2</SUB> thin film
• center-of-mass quantization
• tight-binding exciton model
• band structure

詳細情報

• CRID: 1390001204196264448
• NII論文ID: 130005437277
• NII論文ID: 110007097876
• NII論文ID: 210000107669
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.78.024702
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 9800320
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9800320
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.78.024702
• 本文言語コード: en
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