JC Eilbeck and F Palmero (pdf copy 340 kb)
In one dimensional translationally invariant anharmonic lattice, an extended Bloch state with two or more strongly correlated particles is usually called a quantum breather. Here we study an attractive fermionic Hubbard model with two kind of particles of opposite spin. We discuss the existence of breathers, and several effects that break the translational symmetry of the system and localize the breather in the lattice.
In FK Abdullaev and VV Konotop, editors, Nonlinear Waves: Classical
and Quantum Aspects, Kluwer, Amsterdam, pages 399-412, 2004. ISBN: 1-4020-2188-7.
arXiv:nlin.PS/0310043.