2016/06/30 by Axel U. J. Lode, Christoph Bruder · 1 citation
Physics and Astronomy · #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.118.013603
published as Phys. Rev. Lett. 118, 013603 (2017) · 4 pages, 4 figures; 11 pages of Supplementary Information including 2 figures. Software available at http://ultracold.org
arxiv created 2016/12/21 · arxiv updated 2017/01/11
The Dicke model and the superradiance of two-level systems in a radiation field have many applications. Recently, a Dicke quantum phase transition has been realized with a Bose-Einstein condensate in a cavity. We numerically solve the many-body Schrödinger equation and study correlations in the ground state of interacting bosons in a cavity as a function of the strength of a driving laser. Beyond a critical strength, the bosons occupy multiple modes macroscopically while remaining superradiant. This fragmented superradiance can be detected by analyzing the variance of single-shot measurements.