Piezoelectricity-induced terahertz photon absorption by confined acoustic phonons in wurtzite CdSe nanocrystals

Tzu Ming Liu, Meng Ju Yang, Chih Wei Lai, Pi Tai Chou, Ming Hao Chang, Hsiang Lin Liu, Chi Kuang Sun

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We report here the observation of piezoelectricity-induced terahertz photon absorption related to confined acoustic phonons in nanoparticles. Terahertz photon inactive (l=0) breathing modes become terahertz photon active in wurtzite CdSe nanocrystals due to the piezoelectric coupling. Obvious absorption peaks related to (l=0) modes appeared in the terahertz absorption spectra and the frequency of the peaks were inversely proportional to the size of the CdSe nanocrystals. This piezoelectrically coupled electric vibration provides a mechanism for low-dimensional systems to convert a terahertz photon into a phonon of the same frequency.

Original languageEnglish
Article number085428
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number8
Publication statusPublished - 2008 Feb 26


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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