Strongly Interacting Two-Dimensional Bose Gases

Abstract

We prepare and study strongly interacting two-dimensional Bose gases in the superfluid, the classical Berezinskii-Kosterlitz-Thouless (BKT) transition, and the vacuum-to-superfluid quantum critical regimes. A wide range of the two-body interaction strength 0.05 < g < 3 is covered by tuning the scattering length and by loading the sample into an optical lattice. Based on the equations of state measurements, we extract the coupling constants as well as critical thermodynamic quantities in different regimes. In the superfluid and the BKT transition regimes, the extracted coupling constants show significant down-shifts from the mean-field and perturbation calculations when g approaches or exceeds one. In the BKT and the quantum critical regimes, all measured thermodynamic quantities show logarithmic dependence on the interaction strength, a tendency confirmed by the extended classical-field and renormalization calculations.

5 pages, 4 figures

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Cited by in corpus (13)

• Emergence of coherence in a uniform quasi-two-dimensional Bose gas
• Theory of Bosons in two-leg ladders with large magnetic fields
• Loading and compression of a single two-dimensional Bose gas in an optical accordion
• Connecting Berezinskii-Kosterlitz-Thouless and BEC phase transitions by tuning interactions in a trapped gas
• Dimensional crossover and cold-atom realization of topological Mott insulators
• Weakly bound states of two- and three-boson systems in the crossover from two to three dimension
• Two-dimensional Bose gases near resonance: universal three-body effects
• Universal spatiotemporal dynamics of spontaneous superfluidity breakdown in the presence of synthetic gauge fields
• First and second sound in a two-dimensional dilute Bose gas across the Berezinskii-Kosterlitz-Thouless transition
• Creating fractional quantum Hall states with atomic clusters using light-assisted insertion of angular momentum
• Stability and Anomalous Compressibility of Bose Gases Near Resonance: The scale-dependent interactions and thermal effects
• Thermodynamics and renormalized quasi-particles in the vicinity of the dilute Bose gas quantum critical point in two dimensions
• Phase correlations and quasicondensate in a two-dimensional ultracold Fermi gas