Correlation effects and the high-frequency spin susceptibility of an electron liquid: Exact limits

Article

关键词: DENSITY-FUNCTIONAL THEORY;    METALLIC DENSITIES;    LINEAR-RESPONSE;    WAVE VECTORS;    EXCHANGE;    GAS;    FLUCTUATION;   

DOI  :  10.1103/PhysRevB.67.233104

来源: SCIE

【 摘 要 】

Spin correlations in an interacting electron liquid are studied in the high-frequency limit and in both two and three dimensions. The third-moment sum rule is evaluated and is used to derive exact limiting forms (at both long and short wavelengths) for the spin-antisymmetric local-field factor, lim(omega-->infinity)G(-)(q,omega). In two dimensions lim(omega-->infinity)G(-)(q,omega) is found to diverge as 1/q at long wavelengths, and the spin-antisymmetric exchange-correlation kernel of time-dependent spin density functional theory diverges as 1/q(2) in both two and three dimensions. These signal a failure of the local-density approximation, one that can be redressed by alternative approaches.

【 授权许可】

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