Myriad phases of the checkerboard Hubbard model
نویسندگان
چکیده
منابع مشابه
Work supported in part by US Department of Energy contract DE-AC02-76SF00515. Myriad phases of the Checkerboard Hubbard Model
The zero-temperature phase diagram of the checkerboard Hubbard model is obtained in the solvable limit in which it consists of weakly coupled square plaquettes. As a function of the on-site Coulomb repulsion U and the density of holes per site, x, we demonstrate the existence of at least 16 distinct phases. For instance, at zero doping, the ground state is a novel d-wave Mott insulator (d-Mott)...
متن کاملTopological phases of the Kitaev-Hubbard model at half filling
The Kitaev-Hubbard model of interacting fermions is defined on the honeycomb lattice and, at strong coupling, interpolates between the Heisenberg model and the Kitaev model. It is basically a Hubbard model with ordinary hopping t and spin-dependent hopping t ′. We study this model in the weak to intermediate coupling regime, at half filling, using the cellular dynamical impurity approximation (...
متن کاملSymmetries and mean-field phases of the extended Hubbard model.
The two-dimensional extended Hubbard model that includes a nearestneighbor Heisenberg interaction is studied using a mean-field theory where quasiparticles are defined by an U(8) group of canonical transformations. The theory is a generalization of the ordinary BCS theory, and Balian and Werthamer’s theory of 3He that permits both broken gauge, spin and sublattice symmetry. This allows us to in...
متن کاملPossible phases of the two-dimensional t-t′ Hubbard model
We present a stability analysis of the 2D t-t′ Hubbard model on a square lattice for various values of the next-nearest-neighbor hopping t′ and electron concentration. Using the free energy expression, derived by means of the flow equations method, we have performed numerical calculation for the various representations under the point group C4ν in order to determine at which temperature symmetr...
متن کاملStrong-coupling phases of the t-t8 Hubbard model
We study the strong-coupling regime of the t-t8 Hubbard model, filled up to the level of the van Hove singularities, by means of an exact diagonalization approach. We characterize the different phases of the model by the different sectors of the Hilbert space with given quantum numbers. By looking for the ground state of the system, we find essentially the competition between a state with incip...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2007
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.76.161104