Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-05-03
Phys. Rev. A 84, 013615 (2011)
Physics
Condensed Matter
Quantum Gases
10 pages, 8 figures
Scientific paper
We study the evolution of bosons in a periodically driven optical lattice during a slow change of the driving amplitude. Both the regime of high frequency and low frequency driving are investigated. In the low frequency regime, resonant absorption of energy is observed. In the high frequency regime, the dynamics is compared to a system with an effective Hamiltonian in which the atoms are `dressed' by the driving field. This `dressing' can dramatically change the amplitude and sign of the effective tunneling. A particular focus of this study is the investigation of the time-scales necessary for the evolving quantum state to follow almost adiabatically to the ground-state of the effective many body system.
Kollath Corinna
Poletti Dario
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