Quantum-entanglement aspects of polaron systems
| dc.creator | Stojanovic, Vladimir M. | |
| dc.creator | Vanevic, Mihajlo | |
| dc.date | 2008-08-19 | |
| dc.date | 2008-12-11 | |
| dc.date.accessioned | 2026-07-07T12:11:33Z | |
| dc.date.available | 2026-07-07T12:11:33Z | |
| dc.description | We describe quantum entanglement inherent to the polaron ground states of coupled electron-phonon (or, more generally, particle-phonon) systems based on a model comprising both local (Holstein-type) and nonlocal (Peierls-type) coupling. We study this model using a variational method supplemented by the exact numerical diagonalization on a system of finite size. By way of subsequent numerical diagonalization of the reduced density matrix, we determine the particle-phonon entanglement as given by the von Neumann and linear entropies. Our results are strongly indicative of the intimate relationship between the particle localization/delocalization and the particle-phonon entanglement. In particular, we find a compelling evidence for the existence of a nonanalyticity in the entanglement entropies with respect to the Peierls-coupling strength. The occurrence of such nonanalyticity -- not accompanied by an actual quantum phase transition -- reinforces analogous conclusion drawn in several recent studies of entanglement in the realm of quantum-dissipative systems. In addition, we demonstrate that the entanglement entropies saturate inside the self-trapped region where the small-polaron states are nearly maximally mixed. | |
| dc.description | Selected PRB Editors' Suggestion in 1 Dec Issue | |
| dc.identifier | https://arxiv.org/abs/0808.2632 | |
| dc.identifier | http://arxiv.org/abs/0808.2632 | |
| dc.identifier | Phys. Rev. B 78, 214301 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.78.214301 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/210253 | |
| dc.subject | Other Condensed Matter | |
| dc.title | Quantum-entanglement aspects of polaron systems | |
| dc.type | text |