Quantum Breathers in a Nonlinear Lattice

Details Quantum Breathers in a Nonlinear Lattice Quantum Breathers in a Nonlinear Lattice

1996-03-29

arxiv.org/abs/cond-mat/9603187v1

Physics

Condensed Matter

4 pages, RevTex, 4 postscript figures, Physical Relview Letters (in press)

Scientific paper

10.1103/PhysRevLett.76.3598

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.

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