Dynamical structure factor of a nonlinear Klein-Gordon lattice

Laurent Proville (1)

1 SRMP - Service de recherches de métallurgie physique

The quantum modes of a nonlinear Klein-Gordon lattice have been computed numerically [L. Proville, Phys. Rev. B 71, 104306 (2005)]. The on-site nonlinearity has been found to lead to phonon bound states. In the present paper, we compute numerically the dynamical structure factor so as to simulate the coherent scattering cross section at low temperature. The inelastic contribution is studied as a function of the on-site anharmonicity. Interestingly, our numerical method is not limited to the weak anharmonicity and permits one to study thoroughly the spectra of nonlinear phonons.

Mots clés: biphonon; crystal anharmonicity; nonlinear vibration; quantum breathers

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Laurent Proville. Dynamical structure factor of a nonlinear Klein-Gordon lattice. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 72, pp.184301. ⟨10.1103/PhysRevB.72.184301⟩. ⟨hal-00336081⟩