Kilohertz-driven Bose-Einstein condensates in optical lattices
arXiv:1203.1259 · doi:10.1016/B978-0-12-396482-3.00010-7
Abstract
We analyze time-of-flight absorption images obtained with dilute Bose-Einstein con-densates released from shaken optical lattices, both theoretically and experimentally. We argue that weakly interacting, ultracold quantum gases in kilohertz-driven optical potentials constitute equilibrium systems characterized by a steady-state distri-bution of Floquet-state occupation numbers. Our experimental results consistently indicate that a driven ultracold Bose gas tends to occupy a single Floquet state, just as it occupies a single energy eigenstate when there is no forcing. When the driving amplitude is sufficiently high, the Floquet state possessing the lowest mean energy does not necessarily coincide with the Floquet state connected to the ground state of the undriven system. We observe strongly driven Bose gases to condense into the former state under such conditions, thus providing nontrivial examples of dressed matter waves.
36 pages, 3 figures, Advance Atomic Molecular Physics in press
References in corpus (16)
- Many-Body Physics with Ultracold Gases
- Dynamical control of matter-wave tunneling in periodic potentials
- Coherent control of dressed matter waves
- Single Particle Tunneling in Strongly Driven Double Well Potentials
- Observation of photon-assisted tunneling in optical lattices
- Exploring dynamic localization with a Bose-Einstein condensate
- Dynamical band flipping in fermionic lattice systems: An ac-field-driven change of the interaction from repulsive to attractive
- Coherent Delocalization of Atomic Wave Packets in Driven Lattice Potentials
- Tuning the Mott transition in a Bose-Einstein condensate by multi-photon absorption
- AC-induced superfluidity
- Avoided level crossing spectroscopy with dressed matter waves
- Statistical mechanics of Floquet systems with regular and chaotic states
- Generalized acceleration theorem for spatiotemporal Bloch waves
- Driven optical lattices as strong-field simulators
- Dressed matter waves
- Theoretical analysis of super-Bloch oscillations