Population dynamics in Floquet realisation of Harper-Hofstadter Hamiltonian
Physical Review A
American Physical Society
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Bilitewski, T., & Cooper, N. (2015). Population dynamics in Floquet realisation of Harper-Hofstadter Hamiltonian. Physical Review A, 91 (063611)https://doi.org/10.1103/PhysRevA.91.063611
We study the recent Floquet-realisation of the Harper-Hofstadter model in a gas of cold bosonic atoms. We study in detail the scattering processes in this system in the weakly interacting regime due to the interplay of particle interactions and the explicit time dependence of the Floquet states that lead to band transitions and heating. We focus on the experimentally used parameters and explicitly model the transverse confining direction. Based on transition rates computed within the Floquet- Fermi golden rule we obtain band population dynamics which are in agreement with the dynamics observed in experiment. Finally, we discuss whether and how photon-assisted collisions that may be the source heating and band population dynamics might be suppressed in the experimental setup by appropriate design of the transverse confining potential. The suppression of such processes will become increasingly important as the experiments progress into simulating strongly interacting systems in the presence of artificial gauge fields.
This work was supported by EPSRC Grant No EP/K030094/1.
External DOI: https://doi.org/10.1103/PhysRevA.91.063611
This record's URL: https://www.repository.cam.ac.uk/handle/1810/248644
Attribution-NonCommercial 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by-nc/2.0/uk/
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