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

doi:10.1103/PhysRevB.77.085428

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^*

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

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 language	English
Article number	085428
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	77
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.77.085428
Publication status	Published - 2008 Feb 26

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.77.085428

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title = "Piezoelectricity-induced terahertz photon absorption by confined acoustic phonons in wurtzite CdSe nanocrystals",

abstract = "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.",

author = "Liu, \{Tzu Ming\} and Yang, \{Meng Ju\} and Lai, \{Chih Wei\} and Chou, \{Pi Tai\} and Chang, \{Ming Hao\} and Liu, \{Hsiang Lin\} and Sun, \{Chi Kuang\}",

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AU - Liu, Tzu Ming

AU - Yang, Meng Ju

AU - Lai, Chih Wei

AU - Chou, Pi Tai

AU - Chang, Ming Hao

AU - Liu, Hsiang Lin

AU - Sun, Chi Kuang

PY - 2008/2/26

Y1 - 2008/2/26

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevB.77.085428

M3 - Article

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SN - 1098-0121

VL - 77

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 8

M1 - 085428

ER -

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

Abstract

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