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29 March 2024
 
  » arxiv » cond-mat/9802294

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Quantum spin chains in a magnetic field
V. A. Kashurnikov ; N. V. Prokof’ev ; B. V. Svistunov ; M. Troyer ;
Date 27 Feb 1998
Subject Strongly Correlated Electrons; Statistical Mechanics | cond-mat.str-el cond-mat.stat-mech
AbstractWe demonstrate that the ``worm’’ algorithm allows very effective and precise quantum Monte Carlo (QMC) simulations of spin systems in a magnetic field, and its auto-correlation time is rather insensitive to the value of H at low temperature. Magnetization curves for the $s=1/2$ and $s=1$ chains are presented and compared with existing Bethe ansatz and exact diagonalization results. From the Green function analysis we deduce the magnon spectra in the s=1 system, and directly establish the "relativistic" form E(p)=(Delta ^2 +v^2 p^2)^{1/2} of the dispersion law.
Source arXiv, cond-mat/9802294
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