One-dimensional Bose-Hubbard model with nearest-neighbor interaction

A one dimensional nearest neighbor model of coarsening

Inhomogeneous D-Wave Superconductivity and Antiferromagnetism in a Two-Dimensional Extended Hubbard Model with Nearest-Neighbor Attractive Interaction

To understand the interplay of d-wave superconductivity and antiferromagnetism, we consider a two-dimensional extended Hubbard model with nearest neighbor attractive interaction. The Hamiltonian is solved in the mean-field approximation on a finite lattice. In the impurity-free case, the minimum energy solutions show phase separation as predicted previously based on free energy argument. The ph...

The Bose-Hubbard model with disorder in low-dimensional lattices

2 Contents Introduction iii 1 Ultracold atoms on optical lattices and the dirty boson problem 1 1.

Fully frustrated XY model with next-nearest-neighbor interaction

Giancarlo Franzese, 1,2,3,* Vittorio Cataudella, S. E. Korshunov, and Rosario Fazio Istituto Nazionale per la Fisica della Materia (INFM), Unità di Napoli e Catania, Italy Dipartimento di Scienze Fisiche, Universitá ‘‘Federico II,’’ Mostra d’Oltremare, Padiglione 19, 80125 Napoli, Italy Dipartimento di Fisica ‘‘E. Amaldi,’’ Università Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy L. D....

The fully frustrated XY model with next nearest neighbor interaction

We introduce a fully frustrated XY model with nearest neighbor (nn) and next nearest neighbor (nnn) couplings which can be realized in Josephson junction arrays. We study the phase diagram for 0 ≤ x ≤ 1 (x is the ratio between nnn and nn couplings). When x < 1/ √ 2 an Ising and a BerezinskiiKosterlitz-Thouless transitions are present. Both critical temperatures decrease with increasing x. For x...