The dynamic structure factor, S(→q,ω), of single-crystal Li exhibits a strong anisotropy of peak position and peak dispersion. For q>qc (qc is the plasmon cutoff vector), at least the anisotropy of one peak position in S(→q,ω) can be attributed to zone-boundary collective states within the limits of a one-reciprocal-lattice-vector model. Therefore, the double-peak structure of S(→q,ω) for q>qc seems not to be a universal property of the strongly correlated electron gas.
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Schülke et al. (1984) studied this question.
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