The two-dimensional Hubbard model is studied by means of the exact diagonalization method to confirm the possible existence of superconducting (SC) phase. In our model, the Brillouin zone is assumed to be divided into two regions by a superlattice modulation with wave number (π, π), giving ...
We present a powerful method for calculating the thermodynamic properties of the Hubbard model in infinite dimensions, using an exact diagonalization of an Anderson model with a finite number of sites. At finite temperatures, the explicit diagonalization of the Anderson Hamiltonian allows the calculation...
We investigate the trion formation and the effective trionic properties in the attractive Hubbard model with three fermionic colors using exact diagonalization. The crossover to the trionic regime with colorless compound fermions upon increasing strength of the onsite attraction parameter U features ...
1) exact diagonalization 精确对角化1. Based on the Kondo-Peierls-Hubbard model,we have theoretically studied some properties of charge-induced high spin state in diradieal organic molecular magnets, by using the exact diagonalization technique. 采用Kondo-Peierls-Hubbard模型,利用精确对角化方法,理论...
We evaluate the s-wave pairing correlation in the negative-U Hubbard model on the fcc lattice as the system evolves from a two-dimensional thin film to a three-dimensional bulk structure. Exact-diagonalization techniques and a simple int... C Chen - 《Phys Rev B Condens Matter》 被引量: ...
Spin correlator in the Hubbard model as function of the interaction from dmrgpy import fermionchain import numpy as np n = 14 # number of sites fc = fermionchain.Spinful_Fermionic_Chain(n) # first neighbor hopping h = 0 for i in range(n-1): h = h + fc.Cdagup[i]*fc.Cup[i+1...
The effects of electron-lattice coupling in a multiband Hubbard model are investigated by exact diagonalization. For a system with one doped hole, and with... A Dobry,A Greco,J Lorenzana,... - Epl 被引量: 5发表: 1994年 Superconductivity, charge-density waves, antiferromagnetism, and phase ...
The t-J model is one of the simplest models describing the doped Mott insulator with the double-occupancy of electrons being projected out in the hole-doped case. Earlier on, this projection, or the presence of the so-called upper Hubbard band due to interaction, has been argued by ...
The nature of phase transition from an antiferromagnetic SDW polaronic Mott insulator to the paramagnetic bipolaronic CDW Peierls insulator is studied for the half-filled Holstein-Hubbard model in one dimension in the presence of Gaussian phonon anharmon
Symmetry-projected variational approach for ground and excited states of the two-dimensional Hubbard model We present a symmetry-projected configuration mixing scheme to describe ground and excited states, with well defined quantum numbers, of the two-dimensiona... R Rodríguez-Guzmán,KW Schmid,CA ...