arXiv subjects

A. Belkasri

Publications and source records attributed to A. Belkasri.

4 recordsLinked to original sources

arXiv1995

Ground-State Instabilities in The One-dimensional Penson-Kolb-Hubbard Model

Different kinds of instabilities (CDW, SDW, SS) in the 1D Hubbard model with pair-hopping interaction are investigated using an approximate Bethe-Salpeter equation. The study is performed at any density of electrons and for arbitrary values of the model parameters. In the absence of the on-site interaction, no transition occurs at half filling for any finite negative pair-hopping parameter, in agreement with recent results; our calculation suggests that the Penson-Kolb model (t,W) with $\mid W/t\mid<π/\sin k^{}_F$ behaves qualitatively like the Hubbard model (t,U). Phase diagrams of the Penson-Kolb-Hubbard model (t,U,W) at various densities are presented.

cond-mat↗

arXiv1994

A New Approach to Characterise all the Transitive Orientations for an Undirected Graph

A new approach to find all the transitive orientations for a comparability graph (finite or infinite) is presented. This approach is based on the link between the notion of ``strong'' partitive set and the forcing theory (notions of simplices and multiplices). A mathematical algorithm is given for the case of a comparability graph which has only non limit sub-graphs.

alg-geom↗

arXiv1994

Existence of Long-Range Order in Quasi-Two-Dimensional Hubbard Model

In recent work of Monthoux and Pines~[1] and also in Rice et {\sl al.}'s work~[2], quasi-averages like $\langle c_{k \uparrow} c_{- k \downarrow} \rangle$ were considered even in the case of a dimension less or equal two. But it is well known from the old work of Hohenberg~[3] that these quasi-averages are zero at $T \not= 0$ in case of 1 and 2 dimensions. In this communication we apply the result of Hohenberg to the Hubbard model and prove that in the case of quasi-two-dimension, the inequality of Bogoliubov is not in contradiction with having $\langle c_{k \uparrow} c_{- k \downarrow} \rangle \not= 0$ (at $T \not= 0$) even for a system of three layers.

cond-mat↗

arXiv1994

Motion of a Single Hole in a Disordered Magnetic Background

The spectrum of a single hole is calculated within the spin-hole model using a variational method. This calculation is done for any rotational invariant magnetic background. We have found that when the magnetic background changes from a disordered to a locally ordered state, the spectrum changes qualitatively. We have also found that the spin pattern around the hole is polarized. This problem is related to the study of copper oxide planes $CuO_2$ doped with a small number of holes.

cond-mat↗