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Response of Bose gases in time-dependent optical superlattices | | M. Hild
; F. Schmitt
; R. Roth
; | | Date: |
27 Jun 2006 | | Subject: | Statistical Mechanics | | Abstract: | The dynamic response of ultracold Bose gases in one-dimensional optical lattices and superlattices is investigated based on an exact numerical time evolution in the framework of the Bose-Hubbard model. The system is excited by a temporal amplitude modulation of the lattice potential, as it was already realized in experiment. For regular lattice potentials, the dynamic signatures of the superfluid to Mott-insulator transition are studied and the position and the fine-structure of the resonances is explained by a linear response analysis. This serves as a preparation for the investigation of dynamical signatures of quantum phase transitions in two-colour superlattice potentials. Using direct simulations as well as a perturbative analysis it is shown that the excitation spectrum changes significantly when going from the homogeneous Mott-insulator the quasi Bose-glass phase. A characteristic and experimentally accessible signature for the quasi Bose-glass is the appearance of low-lying resonances and a suppression of the dominant resonance of the Mott-insulator phase. | | Source: | arXiv, cond-mat/0606677 | | Services: | Forum | Review | PDF | Favorites | |
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