TY  - JOUR
AU  - Huotari, S.
AU  - Sternemann, C.
AU  - Schülke, W.
AU  - Sturm, K.
AU  - Lustfeld, H.
AU  - Sternemann, H.
AU  - Volmer, M.
AU  - Gusarov, A.
AU  - Müller, H.
AU  - Monaco, G.
TI  - Electron-density dependence of double-plasmon excitations in simple metals
JO  - Physical review / B
VL  - 77
IS  - 19
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-532
SP  - 195125
PY  - 2008
N1  - Record converted from VDB: 12.11.2012
AB  - Double plasmons are unique fingerprints of dynamical correlations in the model of a free-electron gas beyond the random phase approximation. A combined experimental and theoretical study of double-plasmon excitations in three simple metals Na, Mg, and Al is presented. The intensities, spectral shapes, and dispersions of these excitations are analyzed as a function of momentum. The measured double-plasmon intensity is found to increase with a decreasing electron density, which is in good agreement with the expectations of strength of the correlation effects as a function of the electron gas density. The overall quantitative agreement between the experimental and the theoretical results is very good, while the remaining discrepancies may be due to higher order correlation effects and band-structure effects.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000256971600061
DO  - DOI:10.1103/PhysRevB.77.195125
UR  - https://juser.fz-juelich.de/record/532
ER  -