dc.creator | PENTEADO, Poliana H. | |
dc.creator | LIBERO, Valter Luiz | |
dc.date.accessioned | 2012-04-19T15:36:04Z | |
dc.date.accessioned | 2018-07-04T14:42:37Z | |
dc.date.available | 2012-04-19T15:36:04Z | |
dc.date.available | 2018-07-04T14:42:37Z | |
dc.date.created | 2012-04-19T15:36:04Z | |
dc.date.issued | 2010 | |
dc.identifier | PHYSICAL REVIEW B, v.82, n.9, 2010 | |
dc.identifier | 1098-0121 | |
dc.identifier | http://producao.usp.br/handle/BDPI/16545 | |
dc.identifier | 10.1103/PhysRevB.82.092401 | |
dc.identifier | http://dx.doi.org/10.1103/PhysRevB.82.092401 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1613367 | |
dc.description.abstract | We have developed a nonlocal functional of the exchange interaction for the ground-state energy of quantum spin chains described by the Heisenberg Hamiltonian. An alternating chain is used to obtain the correlation energy and a local unit-cell approximation is defined in the context of the density-functional theory. The agreement with our exact numerical data, for small chains, is significantly better than a previous formulation, even for chains with several ferromagnetic or antiferromagnetic bond defects. The results can be particularly relevant in the study of finite spin-1/2 Heisenberg chains, with exchange couplings changing, magnitude, or even sign, from bond-to-bond. | |
dc.language | eng | |
dc.publisher | AMER PHYSICAL SOC | |
dc.relation | Physical Review B | |
dc.rights | Copyright AMER PHYSICAL SOC | |
dc.rights | restrictedAccess | |
dc.title | Ground-state functional for quantum spin chains with bond defects | |
dc.type | Artículos de revistas | |