Exciton–LO-phonon interaction in CuCl spherical quantum dots studied by resonant hyper-Raman spectroscopy

A. V. Baranov, S. Yamauchi, and Y. Masumoto
Phys. Rev. B 56, 10332 – Published 15 October 1997
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Abstract

Resonant hyper-Raman-scattering spectroscopy was applied for studies of the exciton–LO-phonon interaction in spherical CuCl nanocrystals of different sizes embedded in a glass matrix. Both the LO and 2LO phonon bands have shown a prominent resonance with the lowest energy 1S confined exciton state. The ratio of the integral intensities of the LO and 2LO bands ρ was found to increase with increase of the incident photon energy, or decrease of the nanocrystal radius. The Huang-Rhys factor S has been calculated as a function of the nanocrystal size from the experimentally measured values of ρ on the offset harmonic-oscillator model of electron-vibrational coupling. It has been found that S increases monotonically from 0.22 to 0.7, with the nanocrystal radius decreasing from 3.6 to 1.6 nm.

  • Received 18 June 1997

DOI:https://doi.org/10.1103/PhysRevB.56.10332

©1997 American Physical Society

Authors & Affiliations

A. V. Baranov, S. Yamauchi, and Y. Masumoto

  • Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan

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Issue

Vol. 56, Iss. 16 — 15 October 1997

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