Publication: Excitations of the bimodal lsing spin glass on the brickwork lattice
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Issued Date
2009-06-22
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ISSN
13672630
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2-s2.0-67650476239
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Mahidol University
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SCOPUS
Bibliographic Citation
New Journal of Physics. Vol.11, (2009)
Suggested Citation
W. Atisattapong, J. Poulter Excitations of the bimodal lsing spin glass on the brickwork lattice. New Journal of Physics. Vol.11, (2009). doi:10.1088/1367-2630/11/6/063039 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/28347
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Title
Excitations of the bimodal lsing spin glass on the brickwork lattice
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Abstract
An exact algorithm is used to investigate the distributions of the degeneracies of low-energy excited states for the bimodal Ising spin glass on the brickwork lattice. Since the distributions are extreme and do not self-average, we base our conclusions on the most likely values of the degeneracies. Our main result is that the degeneracy of the first excited state per ground state and per spin is finite in the thermodynamic limit. This is very different from the same model on a square lattice where a divergence proportional to the linear lattice size is expected. The energy gap for the brickwork lattice is obviously 27 on finite systems and predicted to be the same in the thermodynamic limit. Our results suggest that a 27 gap is universal for planar bimodal Ising spin glasses. The distribution of the second contribution to the internal energy has a mode close to zero and we predict that the low-temperature specific heat is dominated by the leading term proportional to T-2exp(-2J/kT). © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.