Strongly Interacting Two-Dimensional Bose Gases
arXiv:1211.3456 · doi:10.1103/PhysRevLett.110.145302
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
References in corpus (10)
- Observation of scale invariance and universality in two-dimensional Bose gases
- Dimensional reduction at a quantum critical point
- Critical Point of an Interacting Two-Dimensional Atomic Bose Gas
- The trapped two-dimensional Bose gas: from Bose-Einstein condensation to Berezinskii-Kosterlitz-Thouless physics
- Slow Mass Transport and Statistical Evolution of An Atomic Gas Across the Superfluid-Mott Insulator Transition
- Ground state energy of the two-dimensional weakly interacting Bose gas: First correction beyond Bogoliubov theory
- Universal thermodynamics of a two-dimensional Bose gas
- Competing orders in thermally fluctuating superconductors in two dimensions
- Exploring quantum criticality based on ultracold atoms in optical lattices
- Two-dimensional Bose gases near resonance: universal three-body effects