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      https://www.ias.ac.in/article/fulltext/pram/043/05/0379-0389

    • Keywords

       

      Phonots; non-linear excitation; superlattice

    • Abstract

       

      We have calculated the phonon and periodon dispersion relations in IV–VI semi-conducting bulk PbTe and SnTe and their superlattice structure. The model used here is a one-dimensional lattice which includes harmonic interactions up to second neighbours as well as on-site nonlinear electron-ion interactions at the anion site. We calculate the phonon and periodon dispersion relations in bulk and PbTe-SnTe superlattice for the transverse optic and acoustic modes using the transfer matrix method. Our analysis has predicted correct nature of the folding of acoustic and confinement of optical phonons at various frequency intervals corresponding to pass and stop bands of the superlattices.

    • Author Affiliations

       

      Nabonita D Chowdhury1 Sankar P Sanyal1

      1. Department of Physics, Barkatullah University, Bhopal - 462 026, India
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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