Ground state parameters, finite-size scaling, and low-temperature properties of the two-dimensional S=1/2 XY model

Details Ground state parameters, finite-size scaling, and low-temperature properties of the two-dimensional S=1/2 XY model Ground state parameters, finite-size scaling, and low-temperature properties of the two-dimensional S=1/2 XY model

1999-04-15

arxiv.org/abs/cond-mat/9904220v1

Phys. Rev. B 60, 6588 (1999)

Physics

Condensed Matter

Statistical Mechanics

6 pages, 8 figures

Scientific paper

10.1103/PhysRevB.60.6588

We present high-precision quantum Monte Carlo results for the S=1/2 XY model on a two-dimensional square lattice, in the ground state as well as at finite temperature. The energy, the spin stiffness, the magnetization, and the susceptibility are calculated and extrapolated to the thermodynamic limit. For the ground state, we test a variety of finite-size scaling predictions of effective Lagrangian theory and find good agreement and consistency between the finite-size corrections for different quantities. The low-temperature behavior of the susceptibility and the internal energy is also in good agreement with theoretical predictions.

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