Ground States and Defect Energies of the Two-dimensional XY Spin Glass from a Quasi-Exact Algorithm

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dc.creatorWeigel, Martin
dc.creatorGingras, Michel J. P.
dc.date2005-10-23
dc.date2006-03-10
dc.date.accessioned2026-07-07T06:44:40Z
dc.date.available2026-07-07T06:44:40Z
dc.descriptionWe employ a novel algorithm using a quasi-exact embedded-cluster matching technique as minimization method within a genetic algorithm to reliably obtain numerically exact ground states of the Edwards-Anderson XY spin glass model with bimodal coupling distribution for square lattices of up to 28x28 spins. Contrary to previous conjectures, the ground state of each disorder replica is non-degenerate up to a global O(2) rotation. The scaling of spin and chiral defect energies induced by applying several different sets of boundary conditions exhibits strong crossover effects. This suggests that previous calculations have yielded results far from the asymptotic regime. The novel algorithm and the aspect-ratio scaling technique consistently give $θ_s=-0.308(30)$ and $θ_c=-0.114(16)$ for the spin and chiral stiffness exponents, respectively.
dc.description4 pages, 3 figures, RevTeX4, v2: slightly shortened version as published
dc.identifierhttps://arxiv.org/abs/cond-mat/0510614
dc.identifierhttp://arxiv.org/abs/cond-mat/0510614
dc.identifierPhys. Rev. Lett. 96 (2006) 097206
dc.identifierdoi:10.1103/PhysRevLett.96.097206
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/102854
dc.subjectDisordered Systems and Neural Networks
dc.titleGround States and Defect Energies of the Two-dimensional XY Spin Glass from a Quasi-Exact Algorithm
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