7 papers
Attractive Hubbard model and single-particle pseudogap due to classical pairing fluctuations in two dimensions
Y. M. Vilk, S. Allen, H. Touchette +3
It is shown that in the two-dimensional attractive Hubbard model, the mean-field phase transition is replaced by a renormalized classical regime of fluctuations where a pseudogap o…
Local Moments Coupled to a Strongly Correlated Electron Chain
Samuel Moukouri, Liang Chen, Laurent G. Caron
A 1D model hamiltonian that is motivated by the recent discovery of the heavy-fermion behavior in the cuprates of the type is studied. It consists of interacting…
Numerical renormalization group study of the 1D t-J model
Liang Chen, S. Moukouri
The one-dimensional (1D) model is investigated using the density matrix renormalization group (DMRG) method. We report for the first time a generalization of the DMRG method…
Magnetic and pair correlations of the Hubbard model with next-nearest-neighbor hopping
Alain F. Veilleux, Anne-Marie Daré, Liang Chen +2
A combination of analytical approaches and quantum Monte Carlo simulations is used to study both magnetic and pairing correlations for a version of the Hubbard model that includes…
Calculation of the singlet-triplet gap of the antiferromagnetic Heisenberg Model on the ladder
M. Azzouz, Liang Chen, S. Moukouri
The ground state energy and the singlet-triplet energy gap of the antiferromagnetic Heisenberg model on a ladder is investigated using a mean field theory and the density matrix re…
Theory of spin and charge fluctuations in the Hubbard model
Y. M. Vilk, Liang Chen, A. -M. S. Tremblay
A self-consistent theory of both spin and charge fluctuations in the Hubbard model is presented. It is in quantitative agreement with Monte Carlo data at least up to intermediate c…