Finite-temperature electron correlations in the framework of a dynamic local-field correction

Journal Article · Thu Jul 15 00:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.2037· OSTI ID:6327439

Schweng, H K; Boehm, H M ^[1]

---

1. Institut fuer Theoretische Physik, Johannes Kepler Universitaet Linz, A-4040 Linz-Auhof (Austria)

The quantum-mechanical version of the Singwi-Tosi-Land-Sjoelander (STLS) approximation is applied to finite temperatures. This approximation has two main advantages. First, it includes a dynamic local-field correction and second, it gives positive values for the pair-distribution function in the short-range region at zero temperature. This is even valid for rather low densities. After a description of the numerical difficulties arising with the use of a dynamic approximation, the results for the static-structure factor and the pair-distribution function are discussed thoroughly. Detailed work is performed on the static part of the local-field correction, with special emphasis put on the investigation of its structure. A peak is found at a wave vector [ital q][approx]2.8 (in units of the Fermi wave vector) for small temperatures, which tends towards higher values of [ital q] with increasing temperature. This peak causes an attractive particle-hole interaction in a certain [ital q] region and thus gives rise to the appearance of a charge-density wave. A parametric description is given for the static local-field correction in order to simplify further applications. Furthermore, the exchange-and-correlation free energy is considered. The results are compared with the STLS results and with the modified convolution approach.

• OSTI ID: 6327439
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 48:4; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON GAS
ELECTRON CORRELATION
DISTRIBUTION FUNCTIONS
EXCHANGE INTERACTIONS
FREE ENERGY
HOLES
STRUCTURE FACTORS
TEMPERATURE DEPENDENCE
CORRELATIONS
ENERGY
FLUIDS
FUNCTIONS
GASES
INTERACTIONS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
665400* - Quantum Physics Aspects of Condensed Matter- (1992-)