Density response of the t-J model and renormalization of breathing and half-breathing phonon modes: A slave-fermion calculation
| dc.creator | Horsch, P. | |
| dc.creator | Khaliullin, G. | |
| dc.creator | Oudovenko, V. | |
| dc.date | 2001-08-17 | |
| dc.date.accessioned | 2026-07-07T02:42:27Z | |
| dc.date.available | 2026-07-07T02:42:27Z | |
| dc.description | The density fluctuation spectrum $N({\bf k},ω)$ is calculated for the t-J model in the low-doping regime using a slave-fermion method for the constrained fermions. The obtained results for $N({\bf k},ω)$ are in good agreement with diagonalization results. The density response is characterized by incoherent, momentum dependent spectral functions reaching up to energies $\sim 8t$ and a low-energy structure at energy $\sim J$ due to transitions in the quasiparticle band. $N({\bf k},ω)$ is shown to lead to a strong renormalization of planar bond-streching and breathing phonon modes with a large phonon linewidth at intermediate momenta caused by the low-energy response. Our results are consistent with recent neutron scattering data, showing the peculiar behavior of these modes. | |
| dc.description | 4 pages, 3 figures, `Materials and Mechanisms of Superconductivity VI' conference, Houston, USA, Febr. 20-25, 2000 | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0108279 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0108279 | |
| dc.identifier | Physica C 341-348, 117 (2000) | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/18145 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Density response of the t-J model and renormalization of breathing and half-breathing phonon modes: A slave-fermion calculation | |
| dc.type | text |