ELECTRON CORRELATION IN METALS
Abstract
Results for the diagonal element of the second-order density matrix (pair function) and for the momentum distribution of an interacting electron gas are presented. In the low density limit, it is shown that, to a similar degree of approximation, the first-order density matrix and hence the momentum distribution may be obtained. In the high-density problem, the pair function has also been calculated using the Green's function approach. From the information thus available in these high and low density limits, the range of usefulness of the concept of the Fermi surface in an interacting electron gas is discussed. Also, results of variational calculations on the stability of Overhauser spin-density waves in metals are reported. It is concluded that such waves reduce the energy below the Hartree-Fock value only when the interaction becomes very strong, or equivalently when the density is very low. Some preliminary work on the correlation problem in a non-uniform electron gas is also briefly discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1961
- Accession Number
- AD0273793
Entities
People
- N. H. March
- S. Sampanthar
Organizations
- University of Sheffield