Connecting Berezinskii-Kosterlitz-Thouless and BEC phase transitions by tuning interactions in a trapped gas

Abstract

We study the critical point for the emergence of coherence in a harmonically trapped two-dimensional Bose gas with tuneable interactions. Over a wide range of interaction strengths we find excellent agreement with the classical-field predictions for the critical point of the Berezinskii-Kosterlitz-Thouless (BKT) superfluid transition. This allows us to quantitatively show, without any free parameters, that the interaction-driven BKT transition smoothly converges onto the purely quantum-statistical Bose-Einstein condensation (BEC) transition in the limit of vanishing interactions.

arXiv comment4 pages, 3 figures

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• Experimental observation of a dissipative phase transition in a multi-mode many-body quantum system
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• Dimensional crossover of nonrelativistic bosons
• Dual lattice functional renormalization group for the Berezinskii-Kosterlitz-Thouless transition: irrelevance of amplitude and out-of-plane fluctuations
• Quench dynamics of an ultracold two-dimensional Bose gas
• Superfluidity and relaxation dynamics of a laser-stirred 2D Bose gas
• Liquid crystal phases of two-dimensional dipolar gases and Berezinskii-Kosterlitz-Thouless melting
• Probing superfluidity in a quasi two-dimensional Bose gas through its local dynamics
• Finite-temperature phases of trapped bosons in a two-dimensional quasiperiodic potential
• Quantized conductance through the quantum evaporation of bosonic atoms
• BCS-BEC crossover of atomic Fermi superfluid in a spherical bubble trap
• Spin- and Momentum-Correlated Atom Pairs Mediated by Photon Exchange and Seeded by Vacuum Fluctuations
• Quasi-long-range order in trapped two-dimensional Bose gases
• Signatures of a universal jump in the superfluid density in two-dimensional Bose gas with finite number of particles
• Defect-Driven Superfluid Crossover for Two-Dimensional Dipolar Excitons Trapped at Thermodynamic Equilibrium
• Observation of Algebraic Time Order for Two-Dimensional Dipolar Excitons
• Phase transition dimensionality crossover from two to three dimensions in a trapped ultracold atomic Bose gas
• Berezinskii-Kosterlitz-Thouless phase transition with Rabi-coupled bosons
• Exploring the Berezinskii-Kosterlitz-Thouless Transition in a Two-dimensional Dipolar Bose Gas
• Coherence of a non-equilibrium polariton condensate across the interaction-mediated phase transition
• Unconventional Berezinskii-Kosterlitz-Thouless Transition in the Multicomponent Polariton System
• Photon BEC with Thermo-Optic Interaction at Dimensional Crossover
• Dimensional crossover in ultracold Fermi gases from Functional Renormalisation
• Dynamics of a Nonequilibrium Discontinuous Quantum Phase Transition in a Spinor Bose-Einstein Condensate
• Symmetry breaking at a topological phase transition
• Thermodynamics and renormalized quasi-particles in the vicinity of the dilute Bose gas quantum critical point in two dimensions
• Uniaxial modulation and the Berezinskii-Kosterlitz-Thouless transition
• Expansion of a quantum gas in a shell trap
• Periodic quenches across the Berezinskii-Kosterlitz-Thouless phase transition
• Tachyon condensation in a chromomagnetic background field and the groundstate of QCD
• Decay of phase-imprinted dark soliton in Bose-Einstein condensate at non-zero temperature
• Detecting Phase Coherence of 2D Bose Gases via Noise Correlations
• Stochastic Gross-Pitaevskii theory for a spin-1 Bose gas: Application to superfluidity in two dimensions
• Simulating the Berezinskii-Kosterlitz-Thouless Transition with Complex Langevin
• Emergent electrostatics in planar XY spin models: the bridge connecting topological order with broken $U(1)$ symmetry
• Local correlations reveal the superfluid to normal boundary in a trapped two-dimensional quantum gas
• Vortex Operator and BKT Transition in Abelian Duality