| dc.contributor | Universidade Estadual Paulista (UNESP) | |
| dc.creator | Doretto, R. L. | |
| dc.creator | Vojta, Matthias | |
| dc.date | 2013-09-30T19:01:43Z | |
| dc.date | 2014-05-20T14:13:29Z | |
| dc.date | 2013-09-30T19:01:43Z | |
| dc.date | 2014-05-20T14:13:29Z | |
| dc.date | 2012-03-26 | |
| dc.date.accessioned | 2017-04-05T22:06:53Z | |
| dc.date.available | 2017-04-05T22:06:53Z | |
| dc.identifier | Physical Review B. College Pk: Amer Physical Soc, v. 85, n. 10, p. 13, 2012. | |
| dc.identifier | 1098-0121 | |
| dc.identifier | http://hdl.handle.net/11449/24632 | |
| dc.identifier | 10.1103/PhysRevB.85.104416 | |
| dc.identifier | WOS:000301915900004 | |
| dc.identifier | WOS000301915900004.pdf | |
| dc.identifier | http://dx.doi.org/10.1103/PhysRevB.85.104416 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/869606 | |
| dc.description | Motivated by experiments on nonmagnetic triangular-lattice Mott insulators, we study one candidate paramagnetic phase, namely the columnar dimer (or valence-bond) phase. We apply variants of the bond-operator theory to a dimerized and spatially anisotropic spin-1/2 Heisenberg model and determine its zero-temperature phase diagram and the spectrum of elementary triplet excitations (triplons). Depending on model parameters, we find that the minimum of the triplon energy is located at either a commensurate or an incommensurate wave vector. Condensation of triplons at this commensurate-incommensurate transition defines a quantum Lifshitz point, with effective dimensional reduction that possibly leads to nontrivial paramagnetic (e.g., spin-liquid) states near the closing of the triplet gap. We also discuss the two-particle decay of high-energy triplons, and we comment on the relevance of our results for the organic Mott insulator (EtMeP)-P-3[Pd(dmit)(2)](2). | |
| dc.description | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
| dc.language | eng | |
| dc.publisher | Amer Physical Soc | |
| dc.relation | Physical Review B | |
| dc.rights | info:eu-repo/semantics/closedAccess | |
| dc.title | Triangular-lattice anisotropic dimerized Heisenberg antiferromagnet: Stability and excitations of the quantum paramagnetic phase | |
| dc.type | Otro | |
