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Replica symmetry breaking in the transverse-field Ising spin-glass model : two fermionic representations
dc.contributor.author | Santos, Eduardo Muccillo Monteiro | pt_BR |
dc.contributor.author | Theumann, Alba Graciela Rivas de | pt_BR |
dc.date.accessioned | 2014-10-09T02:13:09Z | pt_BR |
dc.date.issued | 2005 | pt_BR |
dc.identifier.issn | 1098-0121 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/104303 | pt_BR |
dc.description.abstract | We analyze the infinite range Ising spin glass in a transverse-field below the critical temperature by a one step replica symmetry breaking theory. The set of n replicas is divided in r blocks of m replicas each. We present results for different values of the block-size parameter m. The spin operators are represented by bilinear combinations of fermionic fields and we compare the results of two models: In the four-states 4-S model the diagonal Si z operator has two unphysical vanishing eigenvalues, that are suppressed by a restraint in the two-states 2-S model. In the static approximation we obtain qualitatively similar results for both models. They both exhibit a critical temperature Tc that decreases when increases, until it reaches a quantum critical point at the same value of c and they are both unstable under replica symmetry breaking in the whole spin glass phase. Below the critical temperature we present results for the order parameters and free energy. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 72, no. 1 (July 2005), 014447 5p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Pontos criticos | pt_BR |
dc.subject | Sistemas de férmions | pt_BR |
dc.subject | Modelo de ising | pt_BR |
dc.subject | Vidros de spin | pt_BR |
dc.subject | Autovalores | pt_BR |
dc.subject | Energia livre | pt_BR |
dc.title | Replica symmetry breaking in the transverse-field Ising spin-glass model : two fermionic representations | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000532904 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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