Nonlinear Phonon Modes in Second-Order Anharmonic Coupled Monoatomic Chains

B. Dubus, N. Swinteck, Krishna Muralidharan, J. O. Vasseur, Pierre A Deymier

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have used multiple-time-scales perturbation theory as well as the numerical methods of molecular dynamics and spectral energy density (SED) to investigate the phonon band structure of a two-chain model with second-order anharmonic interactions. We show that when one chain is linear and the other is nonlinear, the two-chain model exhibits a nonlinear resonance near a critical wave number due to mode self-interaction. The nonlinear resonance enables wave number-dependent interband energy transfer. We have also shown that there exist nonlinear modes within the spectral gap separating the lower and upper branches of the phonon band structure. These modes result from three phonon interactions between a phonon belonging to the nonlinear branch and two phonons lying on the lower branch. This phenomenon offers a mechanism for phonon splitting.

Original languageEnglish (US)
Article number041016
JournalJournal of Vibration and Acoustics, Transactions of the ASME
Volume138
Issue number4
DOIs
StatePublished - Aug 1 2016

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Band structure
Phonons
Energy transfer
Molecular dynamics
Numerical methods
interactions
phonons
flux density
perturbation theory
energy transfer
molecular dynamics

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Nonlinear Phonon Modes in Second-Order Anharmonic Coupled Monoatomic Chains. / Dubus, B.; Swinteck, N.; Muralidharan, Krishna; Vasseur, J. O.; Deymier, Pierre A.

In: Journal of Vibration and Acoustics, Transactions of the ASME, Vol. 138, No. 4, 041016, 01.08.2016.

Research output: Contribution to journalArticle

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