Dynamical density-density correlations in one-dimensional Mott insulators
Abstract
The dynamical density-density correlation function is calculated for the one-dimensional, half-filled Hubbard model extended with nearest-neighbor repulsion using the Lánczos algorithm for finite-size systems and analytically for large on-site repulsion compared to hopping amplitudes. At the zone boundary an excitonic feature exists for any finite nearest-neighbor repulsion and exhausts most of the spectral weight, even for parameters where no exciton is visible at zero momentum.
- Publication:
-
Physical Review B
- Pub Date:
- December 1996
- DOI:
- 10.1103/PhysRevB.54.R17269
- arXiv:
- arXiv:cond-mat/9609231
- Bibcode:
- 1996PhRvB..5417269S
- Keywords:
-
- Condensed Matter
- E-Print:
- 5 pages, REVTeX, epsf, 3 postscript figures