The infinite-U Hubbard model on finite two-dimensional square lattices is investigated by the use of exact numerical diagonalization. Configurations with one spin flip away from the ferromagnetic state and up to three holes are studied for lattice sizes ranging from 4*4 to 12*12. For all these...
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...
World line quantum Monte Carlo simulations support the results of exact diagonalization for larger systems and show that kinetic energy is lowered when pairing occurs. The qualitative physics of this model and others in its class, obtained through approximate analytic calculations, is that ...
Exact diagonalization: the Bose–Hubbard model as an example 2010 Eur. J. Phys. 31 591 (http://iopscience.iop.org/0143-0807/31/3/016) 只要抓住粒子数守恒
An exact-diagonalization technique on small clusters is used to study the ground states and single-particle excitations of the Hubbard model with on-site (U) and nearest-neighbor (V) Coulombic repulsive interactions. It is shown that the long-range charge-density-wave state realized in a half-...
The Hubbard model is an essential tool for understanding many-body physics in condensed matter systems. Artificial lattices of dopants in silicon are a promising method for the analog quantum simulation of extended Fermi-Hubbard Hamiltonians in the stron
Motivated by recent advances in fabricating artificial lattices in semiconductors and their promise for quantum simulation of topological materials, we study the one-dimensional dimerized Fermi–Hubbard model. We show how the topological phases at half-f
(1). Inthis Letter, we aim at diagonalizing the Liouvillian andobtain exact results for the ef f ect of dissipation on corre-lated many-body systems.Diagonalization of the Liouvillian.– The one-dimensional Hubbard model, Eq. (2), is known toarXiv:2003.14202v2 [cond-mat.quant-gas] 25 ...
Using exact diagonalization, we calculate the density of states of the two-dimensional Hubbard model on a 4×4 square lattice at U/t=0.5, 4, and 10, and even number of electrons with filling factors n ranging from a quarter filling up to half filling. We compare the ground-state energy...
In this paper we compare numerical results for theground state of the Hubbard model obtained byQuantum-Monte-Carlo simulations with results from exact andstochastic diagonalizations. We find good agreement for theground state energy and superconducting correlations for both,the repulsive and attractive ...