Abbreviated Journal Title
Phys. Rev. B
Metal-Films; Excitations; Physics, Condensed Matter
We discuss the effects of surfaces on bulk plasma oscillations in a metallic film of thickness L. The leading corrections to the plasma frequencies due to the surfaces are proportional to L-1. The frequencies of low-lying long-wavelength modes are given by the dispersion relation of bulk modes, omega = omega(p)[1 + alpha(q2/k(F)2)], where the allowed q values are q(n) = (npi/LBAR), LBAR = L - 2d(b), and d(b) is a complex length characteristic of the surface (reminiscent of, but different from, Feibelman's d(perpendicular-to)). An explicit expression for d(b) is derived. Resonant excitation by an external field E0e(-iwt) is calculated.
Physical Review B
Heinonen, Olle and Kohn, Walter, "Surface Effects On Bulk Plasmons" (1993). Faculty Bibliography 1990s. 721.