Phonon localized modes in a homogeneous anharmonic lattice chain are investigated with the coherent-state method. By making a long-wavelength approximation, we find that the equation of motion for boson operators is a modified Schr\"odinger equation. Envelope-kink phonon localized modes are obtained. These modes lie very near the top of the band and have a small energy gap. In the low-temperature limit, they make an extra contribution to the crystal specific heat. Whether these envelope-soliton phonon localized modes are intrinsic localized modes is also discussed.
No takes yet. Share an insight, caveat, or question.
Shi et al. (1991) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: