Lattice dynamics of the Heisenberg chain coupled to finite frequency bond phonons
| dc.creator | Michel, Franz | |
| dc.creator | Evertz, Hans-Gerd | |
| dc.date | 2007-05-07 | |
| dc.date | 2007-05-07 | |
| dc.date.accessioned | 2026-07-07T07:59:43Z | |
| dc.date.available | 2026-07-07T07:59:43Z | |
| dc.description | The phonon dynamics in a one dimensional Heisenberg spin chain coupled to finite-frequency bond phonons is studied. We present the first detailed phonon spectra for these systems using Quantum Monte Carlo. The quantum phase transition is dominated by a central peak, yet the renormalisation of the main phonon branch depends strongly on the bare phonon frequency omega_0. The main branch remains largely unaffected at omega_0 \gsim J, but it softens completely when omega_0 is low enough. This is an unusual scenario for a structural phase transition and was observable only on sufficiently large systems. Approaching the dimerized phase from finite temperature, the lattice dynamics mirrors the behavior of a three dimensional system. For the efficient measurement of Greens functions, we introduce a mapping from the stochastic series expansion to continuous imaginary time. | |
| dc.description | 5 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/0705.0799 | |
| dc.identifier | http://arxiv.org/abs/0705.0799 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/128473 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Lattice dynamics of the Heisenberg chain coupled to finite frequency bond phonons | |
| dc.type | text |