Our results indicate that the metal-insulator transition rather resembles that of the Hubbard model as soon as a tiny hopping between the more localized fermions is switched on. At low temperatures we observe a first-order metal-insulator transition and a three peak structure. The width of the ...
Microscopical model of a doped fulleride electronic subsystem taking into account the triple orbital degeneracy of energy states is considered within the configurational-operator approach. Using the Green function method the energy spectrum of the model at integer band filling $n=1$ is calculated, ...
We investigate the bandwidth-controlled Mott transition in the Hubbard model on the checkerboard lattice at half filling using the path-integral renormalization group (PIRG) method. It is demonstrated that the system undergoes a first-order phase transition to the plaquette-singlet insulating phase at...
As a function of temperature, lattice structure, and number of electrons, the phase diagram of the model is believed to contain metallic and insulating phases, magnetic ordering, and more exotic phases such as unconventional superconductivity and charge-density waves9. In general, the model is too...
thermoelectric effects in semiconductors and insulators/ Mott-Hubbard modelliquid MnTesubband splittingd-band splittingintraatomic effectA series of experiments performed in our laboratory have shown that liquid alloy systems of the form MTe (M is a transition metal other than Mn) combine salt-like ...
the MIT phase diagramof the 2D Hubbard model has been clarified in the (U, |t ′ |, T) space with a first-order MIT surface with a T > 0 critical end curve for t ′ = 0 at half filling as well as a diverg- ing charge compressibility and/or a tendency to a phase sep...
1.2.3 Simplifications for the Hubbard Model in Z →∞ . . . . . . . 15 1.3 Quantum Monte Carlo Algorithm . . . . . . . . . . . . . . . . . . . . 19 1.3.1 Wick’s Theorem for the Discretized Impurity Problem . . . . 19 1.3.2 Monte Carlo Importance Sampling . ...
bond-charge Hubbard modelHubbard-I approachMott transitionstrongly correlated electronsWe expose the relevance of double occupancy conservation symmetry in application of the Hubbard-I approach to strongly correlated electron systems. We propose the utility of a composite method, viz. the Hubbard-I ...
Using a combination of perturbation theory and quantum Monte Carlo, we elucidate the behavior of the single-particle Green's function and the local spin-spin correlation function near the Mott transition in the infinite dimensional Hubbard model at half filling. The model has three fixed points: ...
A new mean field theory is proposed for the Mott transition in the Hubbard model based on the slave rotor representation of the electron operator. This theory provides a better description of the role of the long range charge correlation in the Mott insulating state and offers a good estimation...