2018/10/31 by Max Schemmer, Isabelle Bouchoule, Benjamin Doyon +1 · 2 citations
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.stat-mech #quant-ph
paper · pdf · doi:10.1103/physrevlett.122.090601
published as Phys. Rev. Lett. 122, 090601 (2019) · v1: 6+11 pages, 4+4 figures. v2: published version, 6+11 pages, 4+6 figures
arxiv created 2019/02/18 · arxiv updated 2019/03/07
The emergence of a special type of fluid-like behavior at large scales in one-dimensional (1d) quantum integrable systems, theoretically predicted in 2016, is established experimentally, by monitoring the time evolution of the in situ density profile of a single 1d cloud of 87\rm Rb atoms trapped on an atom chip after a quench of the longitudinal trapping potential. The theory can be viewed as a dynamical extension of the thermodynamics of Yang and Yang, and applies to the whole range of repulsion strength and temperature of the gas. The measurements, performed on weakly interacting atomic clouds that lie at the crossover between the quasicondensate and the ideal Bose gas regimes, are in very good agreement with the 2016 theory. This contrasts with the previously existing 'conventional' hydrodynamic approach---that relies on the assumption of local thermal equilibrium---, which is unable to reproduce the experimental data.