Spectral-weight transfer: Breakdown of low-energy-scale sum rules in correlated systems
Abstract
In this paper we study the spectral-weight transfer from the high- to the low-energy scale by means of exact diagonalization of finite clusters for the Mott-Hubbard and charge-transfer model. We find that the spectral-weight transfer is very sensitive to the hybridization strength as well as to the amount of doping. This implies that the effective number of low-energy degrees of freedom is a function of the hybridization and therefore of the volume and temperature. In this sense it is not possible to define a Hamiltonian which describes the low-energy-scale physics unless one accepts an effective nonparticle conservation.
- Publication:
-
Physical Review B
- Pub Date:
- August 1993
- DOI:
- 10.1103/PhysRevB.48.3916
- Bibcode:
- 1993PhRvB..48.3916M
- Keywords:
-
- 71.27.+a;
- 71.28.+d;
- 79.60.-i;
- 74.72.-h;
- Strongly correlated electron systems;
- heavy fermions;
- Narrow-band systems;
- intermediate-valence solids;
- Photoemission and photoelectron spectra;
- Cuprate superconductors