Quantum droplet of a two-component Bose gas in an optical lattice near the Mott insulator transition

Abstract

We theoretically study dynamical formation of a quantum droplet in a two-component Bose-Hubbard system with an external trap potential. Specifically, the superfluid in the central region surrounded by the Mott insulator with double filling forms a quantum droplet, which is self-bound thanks to the discontinuous nature of the quantum phase transition between the two phases. We show how to induce the characteristic behavior of the droplet through the control of the trap potential by using the time-dependent Gutzwiller simulations in a two-dimensional system. The static and dynamical properties of the droplet can be described qualitatively by the effective Ginzburg-Landau field theory with cubic-quintic nonlinearities, where the attractive cubic nonlinearlity emerges although all the bare interparticle interactions are repulsive.

9 pages, 5 figures

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Cited by in corpus (6)

• Correlated dynamics of collective droplet excitations in a one-dimensional harmonic trap
• Phases and dynamics of quantum droplets in the crossover to two-dimensions
• Few-body bound states of bosonic mixtures in two-dimensional optical lattices
• Out-of-Equilibrium Dynamics in the Two-Component Bose-Hubbard Model
• Dimensional crossover of bound complexes in a two-species Bose-Hubbard lattice: Correlations and dynamics
• Emergent supercounterfluid and quantum phase diagram of two-component interacting bosons in one-dimensional optical lattice