lattice fermion models (hubbard model, etc.)We analyze the ground-state properties of mixtures consisting of scalar bosons and spin-12 fermions using a mean-field treatment of the local boson-fermion interaction
The phase transitions in the Bose-Fermi-Hubbard model are investigated. The boson Greens function is calculated in the random phase approximation (RPA) and the formalism of the Hubbard operators is used. The regions of existence of the superfluid and Mott insulator phases are established and the ...
PhasediagramofthedisorderedBose-Hubbard model VGurarie LPollet NikolaiProkof'ev UniversityofMassachuses-Amherst,prokofev@physics.umass.edu BorisSvistunov UniversityofMassachuses-Amherst,svistunov@physics.umass.edu MTroyer Followthisandadditionalworksat:h p://scholarworks.umass.edu/physics_faculty_pubs ...
We investigate the ground-state phase diagram of the soft-core Bose-Hubbard model with the nearest-neighbor repulsion on a square lattice by using an unbiased quantum Monte Carlo method. In contrast to a previous study [P. Sengupta , Phys. Rev. Lett.PRLTAO0031-900710.1103/PhysRevLett....
Generic phase diagram of the Bose-Hubbard model in a one dimensional lattice as a function of the hopping parameter J and the chemical potential μc. A trajectory along the red line can cross the critical point without any transition from the superfluid (SF) phase to the Mott insulator (MI...
The fermionic Hubbard model (FHM)1 describes a wide range of physical phenomena resulting from strong electron–electron correlations, including conjectured mechanisms for unconventional superconductivity. Resolving its low-temperature physics is, however, challenging theoretically or numerically. Ultracold ferm...
Mean-Field Phase Diagram for Bose Hubbard Hamiltonians with Random Hoppingdoi:10.1134/s1054660x07040378P. BuonsanteF. MasselV. PennaA. VezzaniBuonsante P, Massel F, Penna V and Vezzani A 2007 Mean-field phase diagram for Bose-Hubbard Hamiltonians with random hopping Laser Phys. 17 538...
2.This constraint stabilizes the attractive bosonic system (U<0) from collapse. If U>0, the ground states are either Mott insulator or atomic superfluid phases of Bose-Hubbard model. 1.The DSF order parameter transforms with the double phase ~ exp(2iθ) compared to the ASF order parameter...
1 A schematic phase diagram for the J1-J2-K model (1) is shown. Here, the anisotropy is set to Δ = −0.15 so as to locate the multi-critical point (0.5, 0) within the abscissa axis [3]. In this paper [3], the abscissa axis K = 0 was investigated, whereas the ordinate ...
6One way of thinking of this field is as a Hubbard-Stratonovich field that accounts for a φ4 interaction between the bosons. In the limit that the φ4 coupling becomes very large this quadratic term for the Hubbard-Stratonovich field vanishes, turning it into a Lagrange multiplier. 7In the...