Size dependent Acoustic Phonon Dynamics of CdTe0.68Se0.32 Nanoparticles in Borosilicate glass

TL;DR

This study investigates how the size of CdTe0.68Se0.32 nanoparticles in borosilicate glass influences their acoustic phonon behavior, revealing size-dependent linewidths, damping times, and quality factors through theoretical modeling.

Contribution

It introduces a comparative analysis of acoustic phonon dynamics in nanoparticles using elastic continuum and fixed boundary models, highlighting medium effects and size dependence.

Findings

Phonon linewidth inversely related to nanoparticle size.

Damping time decreases as nanoparticle size decreases.

Higher quality factor observed for l=2 mode indicating lower energy loss.

Abstract

Low frequency acoustic vibration and phonon linewidth for CdTe0.68Se0.32 nanoparticle embedded in borosilicate glass are calculated using two different approaches by considering the elastic continuum model and fixed boundary condition. The presence of medium significantly affects the phonon peaks and results into the broadening of the modes. The linewidth is found to depend inversely on the size, similar to that reported experimentally. The damping time and quality factor have also been calculated. The damping time that is of the order of picoseconds decreases with the decrease in size. High value of quality factor for l=2 normal mode suggests the less loss of energy for this mode.