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21 papers · 1 filter
Finite size and temperature effects in the AF Heisenberg model
P. Hasenfratz, F. Niedermayer
The low temperature and large volume effects in the d=2+1 antiferromagnetic quantum Heisenberg model are dominated by magnon excitations. The leading and next-to-leading correction…
Small Momentum Evolution of the Extended Drell--Hearn--Gerasimov Sum Rule
Véronique Bernard, Norbert Kaiser, Ulf-G. Meißner
We investigate the momentum dependence of the extended Drell-Hearn-Gerasimov sum rule. An economical formalism is developed which allows to express the extended DHG sum rule in ter…
A determination of the low energy parameters of the 2-d Heisenberg antiferromagnet
U. -J. Wiese, H. -P. Ying
We perform numerical simulations of the 2-d antiferromagnetic quantum Heisenberg model using an efficient cluster algorithm. Comparing the finite size and finite temperature effect…
Blockspin Scheme and Cluster Algorithm for Quantum Spin Systems
He-Ping Ying, Uwe-Jens Wiese
We present a numerical study using a cluster algorithm for the 1-d quantum Heisenberg models. The dynamical critical exponent for anti-ferromagnetic chains is su…
The confined-deconfined interface tension, wetting, and the spectrum of the transfer matrix
B. Grossmann, M. L. Laursen, T. Trappenberg +1
The reduced tension of the interface between the confined and the deconfined phase of pure gauge theory is determined from numerical simulations of the first trans…
Dynamical confinement in bosonized QCD2
A. Ferrando, V. Vento
In the bosonized version of two dimensional theories non trivial boundary conditions (topology) play a crucial role. They are inevitable if one wants to describe non singlet states…