Evidence of Unconventional Universality Class in a Two-Dimensional Dimerized Quantum Heisenberg Model
| dc.creator | Wenzel, Sandro | |
| dc.creator | Bogacz, Leszek | |
| dc.creator | Janke, Wolfhard | |
| dc.date | 2008-05-16 | |
| dc.date | 2008-09-22 | |
| dc.date.accessioned | 2026-07-07T10:03:55Z | |
| dc.date.available | 2026-07-07T10:03:55Z | |
| dc.description | The two-dimensional $J$-$J^\prime$ dimerized quantum Heisenberg model is studied on the square lattice by means of (stochastic series expansion) quantum Monte Carlo simulations as a function of the coupling ratio \hbox{$α=J^\prime/J$}. The critical point of the order-disorder quantum phase transition in the $J$-$J^\prime$ model is determined as \hbox{$α_\mathrm{c}=2.5196(2)$} by finite-size scaling for up to approximately $10 000$ quantum spins. By comparing six dimerized models we show, contrary to the current belief, that the critical exponents of the $J$-$J^\prime$ model are not in agreement with the three-dimensional classical Heisenberg universality class. This lends support to the notion of nontrivial critical excitations at the quantum critical point. | |
| dc.description | 4+ pages, 5 figures, version as published | |
| dc.identifier | https://arxiv.org/abs/0805.2500 | |
| dc.identifier | http://arxiv.org/abs/0805.2500 | |
| dc.identifier | Phys. Rev. Lett. 101, 127202 (2008) | |
| dc.identifier | doi:10.1103/PhysRevLett.101.127202 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/169471 | |
| dc.subject | Statistical Mechanics | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Evidence of Unconventional Universality Class in a Two-Dimensional Dimerized Quantum Heisenberg Model | |
| dc.type | text |