Crossover between Monopole and Multipole Plasmon of Cs Monolayers on Si(111) Individually Resolved in Energy and Momentum | Zendy

Volkmar Zielasek | Zendy; Neele Rönitz | Zendy; M. Henzler | Zendy; H. Pfnür | Zendy

Open Access

Crossover between Monopole and Multipole Plasmon of Cs Monolayers on Si(111) Individually Resolved in Energy and Momentum

Author(s) -

Volkmar Zielasek,

Neele Rönitz,

M. Henzler,

H. Pfnür

Publication year - 2006

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.96.196801

Subject(s) - multipole expansion , plasmon , surface plasmon , scattering , overlayer , dipole , angular momentum , physics , surface plasmon polariton , electron energy loss spectroscopy , atomic physics , molecular physics , condensed matter physics , optics , electron , quantum mechanics

The evolution of the plasmon spectrum of the Si(111) (7 x 7)-Cs surface has been studied by energy loss spectroscopy individually resolved in energy and momentum during the transition from substrate to Cs overlayer metallization. The multipole plasmon is identified by an extremely narrow angular distribution of the inelastic electron scattering, unaccounted for by standard dipole scattering theory. A crossover between multipole and monopole surface plasmon is observed at finite surface wave vectors , depending on Cs coverage, and reveals a high sensitivity of the short-wavelength multipole components on surface morphology.

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