Quantum Gutzwiller approach for the two-component Bose-Hubbard model
arXiv:2110.13095 · doi:10.21468/SciPostPhys.12.3.111
Abstract
We study the effects of quantum fluctuations in the two-component Bose-Hubbard model generalizing to mixtures the quantum Gutzwiller approach introduced recently in [Phys. Rev. Research 2, 033276 (2020)]. As a basis for our study, we analyze the mean-field ground-state phase diagram and spectrum of elementary excitations, with particular emphasis on the quantum phase transitions of the model. Within the quantum critical regimes, we address both the superfluid transport properties and the linear response dynamics to density and spin probes of direct experimental relevance. Crucially, we find that quantum fluctuations have a dramatic effect on the drag between the superfluid species of the system, particularly in the vicinity of the paired and antipaired phases absent in the usual one-component Bose-Hubbard model. Additionally, we analyse the contributions of quantum corrections to the one-body coherence and density/spin fluctuations from the perspective of the collective modes of the system, providing results for the few-body correlations in all the regimes of the phase diagram.
50 pages, 17 figures
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Cited by in corpus (14)
- Lattice polarons across the superfluid to Mott insulator transition
- Observation of counterflow superfluidity in a two-component Mott insulator
- Ground state properties of a multi-component bosonic mixture: a Gutzwiller mean-field study
- Lattice Bose polarons at strong coupling and quantum criticality
- Emergent Mott-insulators at non-integer fillings and devil's staircase induced by attractive interaction in many-body polarons
- Conductivity of lattice bosons at high temperatures
- Formation of paired phases of bosons and their excitations in a square lattice
- Drag-induced dynamical formation of dark solitons in Bose mixture on a ring
- Few-body bound states of bosonic mixtures in two-dimensional optical lattices
- Ground-state phase diagram of two-component interacting bosons on a two-leg ladder
- Out-of-Equilibrium Dynamics in the Two-Component Bose-Hubbard Model
- Miscibility-Immiscibility transition of strongly interacting bosonic mixtures in optical lattices
- Emergent supercounterfluid and quantum phase diagram of two-component interacting bosons in one-dimensional optical lattice
- Magnetization-induced reordering of ground states phase diagram in a two-component Bose-Hubbard model