Momentum distribution in the unitary Bose gas from first principles

Abstract

We consider a realistic bosonic N-particle model with unitary interactions relevant for Efimov physics. Using quantum Monte Carlo methods, we find that the critical temperature for Bose-Einstein condensation is decreased with respect to the ideal Bose gas. We also determine the full momentum distribution of the gas, including its universal asymptotic behavior, and compare this crucial observable to recent experimental data. Similar to the experiments with different atomic species, differentiated solely by a three-body length scale, our model only depends on a single parameter. We establish a weak influence of this parameter on physical observables. In current experiments, the thermodynamic instability of our model from the atomic gas towards an Efimov liquid could be masked by the dynamical instability due to three-body losses.

6+3 pages, 4+4 figures

References in corpus (12)

• Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
• Critical Dynamics of Spontaneous Symmetry Breaking in a Homogeneous Bose gas
• Observation of heteronuclear atomic Efimov resonances
• Observation of Efimov Resonances in a Mixture with Extreme Mass Imbalance
• Two-dimensional dynamics of expansion of a degenerate Bose gas
• Universal Relations for Identical Bosons from 3-Body Physics
• Single-Particle Momentum Distribution of an Efimov trimer
• Universal Loss Dynamics in a Unitary Bose Gas
• Monte Carlo Simulations of the Unitary Bose Gas
• Efimov correlations in strongly interacting Bose gases
• Incorporating exact two-body propagators for zero-range interactions into $N$-body Monte Carlo simulations
• Equation of state and contact of a strongly interacting Bose gas in the normal state

Cited by in corpus (6)

• Efimov Physics: a review
• Universal Prethermal Dynamics of Bose Gases Quenched to Unitarity
• Universal Scaling Laws in the Dynamics of a Homogeneous Unitary Bose Gas
• Efimov Physics in Quenched Unitary Bose Gases
• Ground-state properties of unitary bosons: from clusters to matter
• Renormalized contact interaction in degenerate unitary Bose gases