Quantum Breathers in a Nonlinear Lattice
Condensed Matter
2009-10-28 v1
Abstract
We study nonlinear phonon excitations in a one-dimensional quantum nonlinear lattice model using numerical exact diagonalization. We find that multi-phonon bound states exist as eigenstates which are natural counterparts of breather solutions of classical nonlinear systems. In a translationally invariant system, these quantum breather states form particle-like bands and are characterized by a finite correlation length. The dynamic structure factor has significant intensity for the breather states, with a corresponding quenching of the neighboring bands of multi-phonon extended states.
Cite
@article{arxiv.cond-mat/9603187,
title = {Quantum Breathers in a Nonlinear Lattice},
author = {W. Z. Wang and J. Tinka Gammel and A. R. Bishop and M. I. Salkola},
journal= {arXiv preprint arXiv:cond-mat/9603187},
year = {2009}
}
Comments
4 pages, RevTex, 4 postscript figures, Physical Relview Letters (in press)