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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  • 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

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

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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.

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