Pair Superfluidity of Three-Body Constrained Bosons in Two Dimensions

Abstract

We examine the equilibrium properties of lattice bosons with attractive on-site interactions in the presence of a three-body hard-core constraint that stabilizes the system against collapse and gives rise to a dimer superfluid phase formed by virtual hopping processes of boson pairs. Employing quantum Monte Carlo simulations, the ground state phase diagram of this system on the square lattice is analyzed. In particular, we study the quantum phase transition between the atomic and dimer superfluid regime and analyze the nature of the superfluid-insulator transitions. Evidence is provided for the existence of a tricritical point along the saturation transition line, where the transition changes from being first-order to a continuous transition of the dilute bose gas of holes. The Berzinskii-Kosterlitz-Thouless transition from the dimer superfluid to the normal fluid is found to be consistent with an anomalous stiffness jump, as expected from the unbinding of half-vortices.

4+ pages including 4 figures

References in corpus (13)

• Many-Body Physics with Ultracold Gases
• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• Strong dissipation inhibits losses and induces correlations in cold molecular gases
• Atomic three-body loss as a dynamical three-body interaction
• Generalized Directed Loop Method for Quantum Monte Carlo Simulations
• Precision measurement of spin-dependent interaction strengths for spin-1 and spin-2 87Rb atoms
• Stochastic series expansion method for quantum Ising models with arbitrary interactions
• Topological defects and the superfluid transition of the $s=1$ spinor condensate in two dimensions
• Emerging Bosons with Three-Body Interactions from Spin-1 Atoms in Optical Lattices
• Superfluidity and phase transitions in a resonant Bose gas
• Single-particle versus pair condensation of hard-core bosons with correlated hopping
• Superfluid-Insulator Transitions in Attractive Bose-Hubbard Model with Three-Body Constraint

Cited by in corpus (1)

• Phase diagram and continuous pair-unbinding transition of the bilinear-biquadratic S=1 Heisenberg chain in a magnetic field