G. Orso 1, A. Iucci 2, 3, M. A. Cazalilla 4, 5, T. Giamarchi 3
Physical Review A: Atomic, Molecular and Optical Physics 80 (2009) 033625
We compute the absorption spectrum of strongly repulsive one-dimensional bosons in a disordered or quasi-periodic optical lattice. At commensurate filling, the particle-hole resonances of the Mott insulator are broadened as the disorder strength is increased. In the non-commensurate case, mapping the problem to the Anderson model allows us to study the Bose-glass phase. Surprisingly we find that a perturbative treatment in both cases, weak and strong disorder, gives a good description at all frequencies. In particular we find that the infrared absorption rate in the thermodynamic limit is quadratic in frequency. This result is unexpected, since for other quantities like the conductivity in one dimensional systems, perturbation theory is only applicable at high frequencies. We discuss applications to recent experiments on optical lattice systems, and in particular the effect of the harmonic trap.
- 1. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
CNRS : UMR8626 – Université Paris XI – Paris Sud - 2. Instituto de Fisica la Plata (IFLP),
Universidad Nacional de la Plata - 3. DPMC-MaNEP, University of Geneva,
University of Geneva - 4. Centro de Fisica de Materiales (CSIS-UPV/EHU),
University San Sebastian - 5. Donostia International Physics Center (DIPC),
University San Sebastian