Abstract.
The stiffness exponents in the glass phase for lattice spin glasses in dimensions \(d = 3,\ldots,6\) are determined. To this end, we consider bond-diluted lattices near the T = 0 glass transition point p *. This transition for discrete bond distributions occurs just above the bond percolation point p c in each dimension. Numerics suggests that both points, p c and p *, seem to share the same 1/d-expansion, at least for several leading orders, each starting with 1/(2d). Hence, these lattice graphs have average connectivities of \(\alpha = 2dp\gtrsim1\) near p * and exact graph-reduction methods become very effective in eliminating recursively all spins of connectivity \(\leq3\), allowing the treatment of lattices of lengths up to L = 30 and with up to 105-106 spins. Using finite-size scaling, data for the defect energy width \(\sigma(\Delta E)\) over a range of p > p * in each dimension can be combined to reach scaling regimes of about one decade in the scaling variable \(L(p-p^*)^{\nu^*}\). Accordingly, unprecedented accuracy is obtained for the stiffness exponents compared to undiluted lattices (p = 1), where scaling is far more limited. Surprisingly, scaling corrections typically are more benign for diluted lattices. We find in \(d = 3,\ldots,6\) for the stiffness exponents y 3 = 0.24(1), y 4 = 0.61(2), y 5 = 0.88(5), and y 6 = 1.1(1).
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Received: 29 October 2003, Published online: 20 April 2004
PACS:
05.50. + q Lattice theory and statistics (Ising, Potts, etc.) - 64.60.Cn Order-disorder transformations; statistical mechanics of model systems - 75.10.Nr Spin-glass and other random models - 02.60.Pn Numerical optimization
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Boettcher, S. Stiffness exponents for lattice spin glasses in dimensions \(\mathsf{d = 3,\ldots,6}\) . Eur. Phys. J. B 38, 83–91 (2004). https://doi.org/10.1140/epjb/e2004-00102-5
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DOI: https://doi.org/10.1140/epjb/e2004-00102-5