Spectral densities of infinite systems with strong electron correlations

✍ Scribed by Peter Fulde; Patrick Unger; Jun-Ichi Igarashi

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 219 KB
• Volume: 63
• Category: Article
• ISSN: 0020-7608
• DOI: 10.1002/(sici)1097-461x(1997)63:3<645::aid-qua6>3.0.co;2-w

✦ Synopsis

Until now, solids with strongly correlated electrons can be treated only by model Hamiltonians. Even then a calculation of spectral densities is not simple, because the strong Coulomb interactions prevent us from treating correlations perturbatively. We show that projection and partitioning techniques are a very valuable tool here. The method is applied to computations of the density of states of transition metals, in particular, Ni. Here, the band narrowing and the sattlite peak at 6 eV due to correlations are reproduced. A second application concerns the spectral density of doped and undoped Cu-O planes which are part of the high-T superconducting materials.