Volume 98, Number 4, May 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||25 May 2012|
Finite-size corrections for ground states of Edwards-Anderson spin glasses
Physics Department, Emory University - Atlanta, GA 30322, USA
Accepted: 24 April 2012
Extensive computations of ground-state energies of the Edwards-Anderson spin glass on bond-diluted, hypercubic lattices are conducted in dimensions d=3, …, 7. Results are presented for bond densities exactly at the percolation threshold, p=pc, and deep within the glassy regime, p>pc, where finding ground states is one of the hardest combinatorial optimization problems. Finite-size corrections of the form 1/Nω are shown to be consistent throughout with the prediction ω=1−y/d, where y refers to the “stiffness” exponent that controls the formation of domain wall excitations at low temperatures. At p=pc, an extrapolation for d→∞ appears to match our mean-field results for these corrections. In the glassy phase, however, ω does not approach its anticipated mean-field value of 2/3, obtained from simulations of the Sherrington-Kirkpatrick spin glass on an N-clique graph. Instead, the value of ω reached at the upper critical dimension matches another type of mean-field spin glass models, namely those on sparse random networks of regular degree called Bethe lattices.
PACS: 75.10.Nr – Spin-glass and other random models / 02.60.Pn – Numerical optimization / 05.50.+q – Lattice theory and statistics (Ising, Potts, etc.)
© EPLA, 2012
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