4 papers
Thermodynamics of Random Ferromagnetic Antiferromagnetic Spin-1/2 Chains
Beat Frischmuth, Manfred Sigrist, Beat Ammon +1
Using the quantum Monte Carlo Loop algorithm, we calculate the temperature dependence of the uniform susceptibility, the specific heat, the correlation length, the generalized stag…
Thermodynamic properties of the one-dimensional Kondo insulators studied by the density matrix renormalization group method
N. Shibata, B. Ammon, M. Troyer +2
Thermodynamic properties of the one-dimensional Kondo lattice model at half-filling are studied by the density matrix renormalization group method applied to the quantum transfer m…
Quantum Monte Carlo Loop Algorithm for the t-J Model
Beat Ammon, Hans Gerd Evertz, Naoki Kawashima +2
We propose a generalization of the Quantum Monte Carlo loop algorithm to the t-J model by a mapping to three coupled six-vertex models. The autocorrelation times are reduced by ord…
Effect of the Three-Site Hopping Term on the t-J Model
Beat Ammon, Matthias Troyer, Hirokazu Tsunetsugu
We have used exact diagonalization and quantum Monte Carlo methods to study the one-dimensional {t-J} model including the three-site hopping term derived from the strong coupling l…