Neel to spin-Peierls transition in the ground state of a quasi-1D Heisenberg model coupled to bond phonons
| dc.creator | Sengupta, Pinaki | |
| dc.date | 2003-07-30 | |
| dc.date.accessioned | 2026-07-07T02:52:40Z | |
| dc.date.available | 2026-07-07T02:52:40Z | |
| dc.description | The spin-Peierls transition in the ground state of a quasi-one-dimensional spin-1/2 Heisenberg model coupled to adiabatic bond phonons is studied using a quantum Monte Carlo (QMC) method. The transition from a gapless Neel state to a spin-gapped Peierls state is explored in the parameter space spanned by the spatial anisotropy and the strength of spin-lattice coupling. It is found that for any finite inter-chain coupling, the transition to a dimerized Peierls ground state occurs only when the spin-lattice coupling exceeds a finite, non-zero critical value. This is in contrast to the pure 1D model, where adiabatic phonons lead to a dimerized ground state for any non-zero spin-phonon coupling. The phase diagram in the above parameter space is mapped out. No evidence is found for a region of co-existing long range magnetic order and dimerization. The vanishing of the Neel order occurs simultaneously with the setting in of the dimerization. | |
| dc.description | 6 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0307746 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0307746 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/21927 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Neel to spin-Peierls transition in the ground state of a quasi-1D Heisenberg model coupled to bond phonons | |
| dc.type | text |