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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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