Takada Y, Yasuhara H. Dynamical structure factor of the homogeneous electron liquid: its accurate shape and the interpretation of experiments on aluminum.
PHYSICAL REVIEW LETTERS 2002;
89:216402. [PMID:
12443437 DOI:
10.1103/physrevlett.89.216402]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2001] [Indexed: 05/24/2023]
Abstract
Based on a highly self-consistent theory maintaining the exact functional relations between the self-energy and the vertex part, we evaluate the dynamical structure factor S(q,omega) of the electron liquid. We find striking deviations from S(q,omega) in the random-phase approximation (RPA) for /q/>p(F); besides a broad peak in the one-pair excitation region as seen in the RPA, a clear shoulder appears along a steepened slope at low omega due to electron-hole multiple scattering, and a flattened structure follows due to inseparable interference between one-pair and multipair excitations. Our result agrees with experiments on Al on the whole. The remaining discrepancy is ascribed to the band-structure-induced effect.
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