381 citations · 1.5k across the 11 of their papers we have counts for
6 papers · 1 filter
Supersolidity from defect-condensation in the extended boson Hubbard model
Yu-Chun Chen, Roger G. Melko, Stefan Wessel +1
We study the ground state phase diagram of the hard-core extended boson Hubbard model on the square lattice with both nearest- (nn) and next-nearest-neighbor (nnn) hopping and repu…
Magnetocaloric effect in two-dimensional spin-1/2 antiferromagnets
A. Honecker, S. Wessel
The magnetocaloric effect is studied at the transition to saturation in the antiferromagnetic spin-1/2 Heisenberg model on the simplest two-dimensional lattices, namely the square…
Generalized Directed Loop Method for Quantum Monte Carlo Simulations
Fabien Alet, Stefan Wessel, Matthias Troyer
Efficient quantum Monte Carlo update schemes called directed loops have recently been proposed, which improve the efficiency of simulations of quantum lattice models. We propose to…
Thermodynamic properties of ferromagnetic mixed-spin chain systems
Noboru Fukushima, Andreas Honecker, Stefan Wessel +1
Using a combination of high-temperature series expansion, exact diagonalization and quantum Monte Carlo, we perform a complementary analysis of the thermodynamic properties of quas…
Inhomogeneously doped two-leg ladder systems
Stefan Wessel, Martin Indergand, Andreas Laeuchli +2
A chemical potential difference between the legs of a two-leg ladder is found to be harmful for Cooper pairing. The instability of superconductivity in such systems is analyzed by…
Phase Diagram of the quadrumerized Shastry-Sutherland Model
Andreas Laeuchli, Stefan Wessel, Manfred Sigrist
We determine the phase diagram of a generalized Shastry-Sutherland model, using a combination of dimer- and quadrumer-boson methods and numerical exact diagonalization techniques.…