Quench-induced breathing mode of one-dimensional Bose gases

Bess Fang (1) , Giuseppe Carleo (1) , Aisling Johnson (1) , Isabelle Bouchoule (1)

1 Laboratoire Charles Fabry / Optique atomique

We measure the position- and momentum- space breathing dynamics of trapped one-dimensional Bose gases. The profile in real space reveals sinusoidal width oscillations whose frequency varies continuously through the quasicondensate to ideal Bose gas crossover. A comparison with theoretical models taking into account the effect of finite temperature is provided. In momentum space, we report the first observation of a frequency doubling in the quasicondensate regime, corresponding to a self-reflection mechanism. The disappearance of this mechanism through the quasicondensation crossover is mapped out.

Domaines: Physique Quantique [quant-ph]; Optique [physics.optics]

Bess Fang, Giuseppe Carleo, Aisling Johnson, Isabelle Bouchoule. Quench-induced breathing mode of one-dimensional Bose gases. Physical Review Letters, 2014, 113, pp.035301. ⟨hal-00916875v3⟩