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arxiv: 1111.5337 · v1 · pith:Y5S3QO76new · submitted 2011-11-02 · ❄️ cond-mat.quant-gas · cond-mat.str-el· math-ph· math.MP

Lindhard function of a d-dimensional Fermi gas

classification ❄️ cond-mat.quant-gas cond-mat.str-elmath-phmath.MP
keywords functionresponsefermifermionsapproximationbaselineclosedcorrelations
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We review in detail the derivation of the dielectric response function of a noninteracting system of spin-1/2 fermions in the random-phase approximation. Results for the response function of a Fermi gas in one, two and three dimensions can be obtained in closed form, and represent the baseline for developing a pedagogical understanding of the effect of correlations on the response functions in interacting systems of fermions.

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    Strong electron correlations in Sr2RuO4 produce unconventional plasmon dispersion, intrinsic width below the electron-hole continuum, and a high-energy peak from incoherent transitions.