J ul 2 00 9 Numerical investigation of the aging of the Fully - Frustrated XY model
نویسنده
چکیده
We study the out-of-equilibrium dynamics of the fully-frustrated XY model. At equilibrium, this model undergoes two phase transitions at two very close temperatures: a Kosterlitz-Thouless topological transition and a secondorder phase transition between a paramagnetic phase and a low-temperature phase where the chiralities of the lattice plaquettes are anti-ferromagnetically ordered. We computed by Monte Carlo simulations two-time spin-spin and chirality-chirality autocorrelation and response functions. Our estimates of the autocorrelation exponents and fluctuation-dissipation ratios follow the same trend as most static critical exponents found in the litterature: they are significantly different from the XY values (for the spin-spin quantities) and the Ising ones (for the chirality-chirality quantities). PACS numbers: 05.10.Ln, 05.50.+q, 05.70.Jk, 05.70.Ln
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