Analytic continuation of the dynamic response function using an N-point Pade approximant

We use the N-point Pade approximant to make the analytic continuation of the dynamic response function. This continuation scheme reproduces very efficiently the plasmon energy dispersion and the dynamic scattering cross section with double peaks for Al. For Si with covalent bondings, the energy-loss function exhibits the anomalous feature in the long-wavelength limit, which was also found in previous work. At large wave vectors, the local-field effect shifts the plasmon excitation peak to higher energy, however, this shift is compensated by the exchange-correlation effect.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
1996-09
Language
ENG
Keywords

AB-INITIO CALCULATIONS; X-RAY-SCATTERING; DIELECTRIC RESPONSE; PLASMON DISPERSION; AL METAL

Citation

PHYSICAL REVIEW B, v.54, no.12, pp.8285 - 8288

ISSN
0163-1829
URI
http://hdl.handle.net/10203/69829
Appears in Collection
PH-Journal Papers(저널논문)
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