Spin Glasses

Giorgio Parisi A

Chris R. Laumann, Antonello Scardicchio, Shivaji L. Sondhi

We discuss quantum spin glasses with finite connectivity by presenting an extension of the cavity method used in studies of classical spin glasses.

Ney Lemke, Ian A. Campbell

We demonstrate numerically that, for Ising spins on square lattices with ferromagnetic second neighbor interactions and random near neighbor interactions, two-dimensional Ising spin glass order with a nonzero freezing temperature can occur. We compare some of the physical properties of these spin glasses with those of standard spin glasses in higher dimensions.

Robert Weingard, Gerrit J. Smith

Hikaru Kawamura

Spin-glass and chiral-glass orderings in three-dimensional Heisenberg spin glasses are studied with and without random magnetic anisotropy by dynamical Monte Carlo simulations. In the isotropic case, clear evidence of a finite-temperature chiral-glass transition is presented. While the spin autocorrelation exhibits only an interrupted aging, the chirality autocorrelation persists to exhibit a pronounced aging effect reminiscent of the one observed in the mean-field model. In the anisotropic case, asymptotic mixing of the spin and the chirality is observed in the off-equilibrium dynamics.