Observation of the Berezinskii-Kosterlitz-Thouless transition in a two-dimensional Bose gas via matter-wave interferometry
Physical Review Letters American Physical Society 128:25 (2022) 250402
Abstract:
We probe local phase fluctuations of trapped two-dimensional (2D) Bose gases using matter-wave interferometry. This enables us to measure the phase correlation function, which changes from an algebraic to an exponential decay when the system crosses the Berezinskii-Kosterlitz-Thouless (BKT) transition. We determine the temperature dependence of the BKT exponent 畏 and find the critical value 畏c = 0.17(3) for our trapped system. Furthermore, we measure the local vortex density as a function of the local phase-space density, which shows a scale-invariant behaviour across the transition. Our experimental investigation is 91探花ed by Monte Carlo simulations and provides a comprehensive understanding of the BKT transition in a trapped system.Quench dynamics of 2D Bose gases across the BKT critical point
(2022)
Abstract:
APS March Meeting 2022 focus session talkFaraday-imaging-induced squeezing of a double-well Bose-Einstein condensate
Physical Review A American Physical Society (APS) 104:5 (2021) 053324
Observation of the BKT Transition in a 2D Bose Gas via Matter-Wave Interferometry
(2021)
Non-equilibrium dynamics of a 2D Bose gas near a critical point
(2021)