A geometrical picture for finite dimensional spin glasses

Details A geometrical picture for finite dimensional spin glasses A geometrical picture for finite dimensional spin glasses

1999-09-14

arxiv.org/abs/cond-mat/9909203v2

Euro. Phys. Lett. 49 (2000) 794-800

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages; modified references, clarifications; to appear in EPL

Scientific paper

10.1209/epl/i2000-00221-7

A controversial issue in spin glass theory is whether mean field correctly describes 3-dimensional spin glasses. If it does, how can replica symmetry breaking arise in terms of spin clusters in Euclidean space? Here we argue that there exist system-size low energy excitations that are sponge-like, generating multiple valleys separated by diverging energy barriers. The droplet model should be valid for length scales smaller than the size of the system (theta > 0), but nevertheless there can be system-size excitations of constant energy without destroying the spin glass phase. The picture we propose then combines droplet-like behavior at finite length scales with a potentially mean field behavior at the system-size scale.

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