Effective spin model for interband transport in a Wannier-Stark lattice system
Institut für Theoretische Physik, Universität
2 Département de Physique, Université de Liège, 4000 Liège, Belgium
a e-mail: email@example.com
Received in final form: 22 October 2010
Published online: 3 December 2010
We show that the interband dynamics in a tilted two-band Bose-Hubbard model can be reduced to an analytically accessible spin model in the case of resonant interband oscillations. This allows us to predict the revival time of these oscillations which decay and revive due to inter-particle interactions. The presented mapping onto the spin model and the so achieved reduction of complexity has interesting perspectives for future studies of many-body systems.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2010