Quantum Phase Transition in a Heisenberg Antiferromagnet on a Square Lattice with Strong Plaquette Interactions
| dc.creator | Albuquerque, A. Fabricio | |
| dc.creator | Troyer, Matthias | |
| dc.creator | Oitmaa, Jaan | |
| dc.date | 2008-07-28 | |
| dc.date | 2008-10-07 | |
| dc.date.accessioned | 2026-07-07T10:07:38Z | |
| dc.date.available | 2026-07-07T10:07:38Z | |
| dc.description | We present numerical results for an $S=1/2$ Heisenberg antiferromagnet on a inhomogeneous square lattice with tunable interaction between spins belonging to different plaquettes. Employing Quantum Monte Carlo, we significantly improve on previous results for the the critical point separating singlet-disordered and Néel-ordered phases, and obtain an estimate for the critical exponent $ν$ consistent with the three-dimensional classical Heisenberg universality class. Additionally, we show that a fairly accurate result for the critical point can be obtained from a Contractor Renormalization (CORE) expansion by applying a surprisingly simple analysis to the effective Hamiltonian. | |
| dc.description | 4+ pages, 3 figures. Published version | |
| dc.identifier | https://arxiv.org/abs/0807.4389 | |
| dc.identifier | http://arxiv.org/abs/0807.4389 | |
| dc.identifier | Phys. Rev. B 78, 132402 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.78.132402 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/170705 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Statistical Mechanics | |
| dc.title | Quantum Phase Transition in a Heisenberg Antiferromagnet on a Square Lattice with Strong Plaquette Interactions | |
| dc.type | text |