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5 papers · 1 filter
Hierarchical mean-field approach to the - Heisenberg model on a square lattice
L. Isaev, G. Ortiz, J. Dukelsky
We study the quantum phase diagram and excitation spectrum of the frustrated - spin-1/2 Heisenberg Hamiltonian. A hierarchical mean-field approach, at the heart of which…
Commensurability effects for fermionic atoms trapped in 1D optical lattices
Rafael A. Molina, Jorge Dukelsky, Peter Schmitteckert
Fermionic atoms in two different hyperfine states confined in optical lattices show strong commensurability effects due to the interplay between the atomic density wave (ADW) order…
Electronic instabilities of a Hubbard model approached as a large array of coupled chains: competition between d-wave superconductivity and pseudogap phase
E. Perfetto, J. Gonzalez
We study the electronic instabilities in a 2D Hubbard model where one of the dimensions has a finite width, so that it can be considered as a large array of coupled chains. The fin…
Numerical estimation of critical parameters using the Bond entropy
Rafael A. Molina, Peter Schmitteckert
Using a model of spinless fermions in a lattice with nearest neighbor and next-nearest neighbor interaction we show that the entropy of the reduced two site density matrix (the bon…
Entanglement in a first order quantum phase transition
J. Vidal, R. Mosseri, J. Dukelsky
The phase diagram of spins 1/2 embedded in a magnetic field mutually interacting antiferromagnetically is determined. Contrary to the ferromagnetic case where a second order quantu…