A new approach to electron–electron interactions in strongly correlated systems at arbitrary spin-polarization and temperature
✍ Scribed by M.W.C. Dharma-wardana
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 151 KB
- Volume
- 127
- Category
- Article
- ISSN
- 0038-1098
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✦ Synopsis
The uniform electron fluid is the reference model for density functional calculations. Even for this system, many-body perturbation theory, and related methods become questionable when the density parameter r s exceeds unity. Hence, quantum Monte Carlo (QMC) simulation has been almost the only applicable method. We review a new approach, which uses a mapping of the quantum fluid to a classical Coulomb fluid, based on density-functional concepts. It is applicable at finite temperatures and arbitrary spin polarizations as well, and correctly recovers even the logarithmic terms in the exchange and correlations energies close to T ¼ 0: We show by detailed comparison with available QMC data that the method yields accurate pairdistribution functions, spin-dependent energies, static local-field factors, Landau parameter-based quantities like m p and g p ; for strongly coupled electron fluids.