Ultracold Bose gases in time-dependent 1D superlattices: response and quasimomentum structure
arXiv:0706.4260 · doi:10.1103/PhysRevA.76.053614
Abstract
The response of ultracold atomic Bose gases in time-dependent optical lattices is discussed based on direct simulations of the time-evolution of the many-body state in the framework of the Bose-Hubbard model. We focus on small-amplitude modulations of the lattice potential as implemented in several recent experiment and study different observables in the region of the first resonance in the Mott-insulator phase. In addition to the energy transfer we investigate the quasimomentum structure of the system which is accessible via the matter-wave interference pattern after a prompt release. We identify characteristic correlations between the excitation frequency and the quasimomentum distribution and study their structure in the presence of a superlattice potential.
4 pages, 4 figures
References in corpus (5)
- Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
- Spectroscopy of ultracold atoms by periodic lattice modulations
- Signatures of the superfluid to Mott-insulator transition in the excitation spectrum of ultracold atoms
- Response of Bose gases in time-dependent optical superlattices
- Bose-Fermi mixtures in 1D optical superlattices