Effect of electron correlations on photoemission from narrow-band metals
- 1 March 1979
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 50 (B3) , 1944-1949
- https://doi.org/10.1063/1.327119
Abstract
Recent angle‐resolved photoemission measurements on Cu and Ni suggest the importance of electron correlations not included in band calculations. To study these effects, we have calculated the photoemission spectrum for the single‐band, strongly ferromagnetic Hubbard model. A hole in the ↑ band is viewed as a core hole which can hop from site to site. For a strong interaction U, a bound level exists below the ↓ band at the site of the spin ↑ hole. The photoemission spectrum consists of a main line (bound level occupied in final state) and a satellite (bound level unoccupied). The binding energy of the satellite is about U larger than that of the main line. The intensity of the main line is approximately n↓, the fractional occupancy of the spin ↓ band. We identify the spin ↑ band (inferred from experiment) with the peak position of the main line as a function of the momentum k↘ transferred to the solid. The ratio of inferred band width to bare band width is approximately n↓. Since the 3d‐bands are filled in Cu, no such band renormalization can occur for it. Strong electron correlations are also responsible for the small exchange splitting in Ni.This publication has 28 references indexed in Scilit:
- Electron delocalization and the characterization of theAuger spectra oftransition metalsPhysical Review B, 1977
- X-Ray Photoemission from Zinc: Evidence for Extra-Atomic Relaxation via Semilocalized ExcitonsPhysical Review B, 1973
- Infrared catastrophy and excitons in the X-ray spectra of metalsJournal de Physique, 1971
- Electron Correlation in Narrow Energy Bands. II. One Reversed Spin in an Otherwise Fully Aligned NarrowBandPhysical Review B, 1969
- Electron Correlation in Narrow Energy Bands. I. The Two-Pole Approximation in a NarrowBandPhysical Review B, 1969
- Excitons in Metals: Infinite Hole MassPhysical Review B, 1967
- One-Particle Properties of an Inhomogeneous Interacting Electron GasPhysical Review B, 1966
- Self-Consistent Equations Including Exchange and Correlation EffectsPhysical Review B, 1965
- Inhomogeneous Electron GasPhysical Review B, 1964
- Exchange splitting in ferromagnetic nickelProceedings of the Physical Society, 1964