Strongly Interacting Two-component Coupled Bose Gas in Optical Lattices
arXiv:2106.00179 · doi:10.1103/PhysRevA.104.053326
Abstract
Two-component coupled Bose gas in a 1D optical lattice is examined. In addition to the postulated Mott insulator and superfluid phases, multiple bosonic components manifest spin degrees of freedom. Coupling of the components in the Bose gas leads to substantial change in the previously observed spin phases, giving rise to new effective spin Hamiltonian and unraveling remarkable spin correlations. The system exhibiting ferromagnetic and non-ferromagnetic spin phases for on-site intra-component interaction stronger than inter-component interaction switches from first-order to second-order phase transition between the spin phases upon introduction of coupling, on which is dependent the transition width. For comparable on-site inter- and intra- component interaction, with coupling, instead of one, two spin phases emerge with a second-order phase transition. Exact diagonalization and Variational Monte Carlo (VMC) with stochastic minimization on Entangled Plaquette State (EPS) bestow a unique and enhanced perspective into the system beyond the scope of a mean-field treatment.
15 pages, 7 figures; improved definition of the unconventional non-FM phase and concise summary of its key features, revised descriptions of the mean-field and ED ground states, additional ED analysis with a symmetry breaking term to provide correspondence with the mean-field treatment, concise figures to focus on only the non-trivial physics and with a consistent color scheme
References in corpus (26)
- Many-Body Physics with Ultracold Gases
- Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
- Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
- Quantum Simulation of Antiferromagnetic Spin Chains in an Optical Lattice
- Single-Spin Addressing in an Atomic Mott Insulator
- Double species condensate with tunable interspecies interactions
- Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms
- Hidden order in 1D Bose insulators
- Implementation of Spin Hamiltonians in Optical Lattices
- Rise and fall of hidden string order of lattice bosons
- Mott insulators in strong electric fields
- Cooling in strongly correlated optical lattices: prospects and challenges
- Spin gradient demagnetization cooling of ultracold atoms
- Phase diagram of the extended Bose Hubbard model
- d-wave resonating valence bond states of fermionic atoms in optical lattices
- A Superradiant Topological Peierls Insulator inside an Optical Cavity
- Intrinsic Heating and Cooling in Adiabatic Processes for Bosons in Optical Lattices
- Spin-1 bosons with coupled ground states in optical lattices
- Phase-Dependent Spontaneous Spin Polarization and Bifurcation Delay in Coupled Two-Component Bose-Einstein Condensates
- Homogeneous and inhomogeneous magnetic phases of constrained dipolar bosons
- Magnetic phases and transitions of the two-species Bose-Hubbard model
- XXZ spin-1/2 representation of a finite-U Bose-Hubbard chain at half-integer filling
- Gap solitons in Rabi lattices
- Entanglement structure of a quantum simulator: the two-component Bose-Hubbard model
- Phase transitions of the coherently coupled two-component Bose gas in a square optical lattice
- Quantum crystal growing: Adiabatic preparation of a bosonic antiferromagnet in the presence of a parabolic inhomogeneity
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- Field Theory of Borromean Super-counterfluids
- Many-body localization and particle multioccupancy in the disordered Bose-Hubbard model