Beyond effective Hamiltonians: micromotion of Bose Einstein condensates in periodically driven optical lattices
Abstract
We investigate a Bose Einstein condensate held in a 1D optical lattice whose phase undergoes a fast oscillation using a statistical analysis. The averaged potential experienced by the atoms boils down to a periodic potential having the same spatial period but with a renormalized depth. However, the atomic dynamics also contains a \emph{micromotion} whose main features are revealed by a Kolmorogov-Smirnov analysis of the experimental momentum distributions. We furthermore discuss the impact of the micromotion on a quench process corresponding to a proper sudden change of the driving amplitude which reverses the curvature of the averaged potential.
Keywords
Cite
@article{arxiv.1910.00661,
title = {Beyond effective Hamiltonians: micromotion of Bose Einstein condensates in periodically driven optical lattices},
author = {M. Arnal and G. Chatelain and C. Cabrera-Gutiérrez and A. Fortun and E. Michon and J. Billy and P. Schlagheck and D. Guéry-Odelin},
journal= {arXiv preprint arXiv:1910.00661},
year = {2020}
}
Comments
Our preprint 1804.02147v1 [cond-mat.quant-gas] has triggered this study dedicated to the micromotion hidden behind effective Hamiltonians generated by fast time-modulation of a parameter