• Corpus ID: 1196174

Pseudogap in the optical phonon spectra

  title={Pseudogap in the optical phonon spectra},
  author={Laurent Proville},
  journal={arXiv: Materials Science},
  • L. Proville
  • Published 23 March 2004
  • Physics
  • arXiv: Materials Science
The energy spectrum of the quantum Klein-Gordon lattice is computed numerically for different nonlinear contributions to the Hamiltonian. In agreement with the studies on the effective Hubbard Hamiltonian for boson quasi-particles (see for instance Refs.\onlinecite{AGRANOVICH,Eilbeck}) a pairing of the phonon states is found when the nonlinearity of the lattice is significant. On the opposite, when the nonlinear contribution is weak or moderate, which is common in materials the effective… 


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Same as [1] but p
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