Artículos de revistas
On The (200)-zone Boundary Collective Mode In Al Within Nearly-free-electron Degenerate Perturbation Theory
Registro en:
Solid State Communications. , v. 51, n. 8, p. 591 - 594, 1984.
381098
10.1016/0038-1098(84)91065-2
2-s2.0-0021475222
Autor
Oliveira L.E.
Sturm K.
Institución
Resumen
The Aschroft and Sturm two-band-model on the optical properties of Al is extended for finite k values and the dielectric function ε{lunate}(k,ω) is evaluated for k parallel to the <100 > direction within nearly-free-electron degenerate perturbation theory. It is shown that a pair of (200) Bragg planes gives rise to another pole in the energy loss function Im[-1/ε{lunate}(k,ω)] and hence to a collective mode which is of the same origin as the so-called zone boundary collective mode first proposed by Foo and Hopfield in Na. The dispersion and the strength of this (200)-zone boundary collective mode in Al are evaluated along the <100 > direction and the theoretical results agree very well with electron energy loss spectroscopy data. Comparison is also made with a numerical calculation by Singhal for some discrete k-values. © 1984. 51 8 591 594 Raether, Excitations of Plasmons and Interband Transitions by Electrons (1980) Springer Tract in Modern Physics, 88. , G. Höhler, Springer, New York Sturm, Electron energy loss in simple metals and semiconductors (1982) Advances in Physics, 31, p. 1 Foo, Hopfield, (1968) Phys. Rev., 173, p. 635 Boersch, Geiger, Imbusch, Niedrig, (1966) Phys. Lett., 22, p. 146 Petri, Otto, (1975) Phys. Rev. Lett., 34, p. 1283 Urner-Wille, (1977) J. Phys. D, 10, p. 49 Chen, Silcox, (1977) Phys. Rev. B, 16, p. 4246 Singhal, (1976) Phys. Rev. B, 14, p. 2352 Ashcroft, Sturm, (1971) Phys. Rev. B, 3, p. 1898 K. Sturm and L.E. Oliveira, submitted to Phys. Rev. BAschroft, Mermin, (1976) Solid State Physics, p. 311. , Holt, Rinehart and Winston, Philadelphia Möller, Otto, Plasmon Dispersion in Aluminum-Magnesium Alloys (1980) Physical Review Letters, 45, p. 2140 Möller, Otto, Möller and Otto Respond (1981) Physical Review Letters, 47, p. 1707 Sturm, Comment on Plasmon Dispersion in Aluminum-Magnesium Alloys (1981) Physical Review Letters, 47, p. 1706 Chen, (1977) phys. stat. sol. (b), 83, p. 347