Overlayer resonance and quantum well state of Cs/Cu(111) studied with angle-resolved photoemission, LEED, and first-principles calculations
Artikel i vetenskaplig tidskrift, 2007

Angle-resolved photoemission spectroscopy and low-energy electron diffraction are used to study submonolayer coverages of Cs on Cu(111) at room temperature (RT) and 170 K. At RT, the Cs saturation coverage is approximately 90% of the full monolayer coverage. The full monolayer is characterized by a quantum well state (QWS) band having an energy of 25 meV below the Fermi level (E-F) in the (Gamma) over bar point and a resonance band extending to energies below the Cu band gap. This is supported by our first-principles calculations. Low-energy electron diffraction shows that the Cs overalyer forms a (2x2) structure over a wide coverage range, in which the QWS has energies from 50 meV above to 25 meV below E-F. The continued energy shift of the QWS after saturation of the diffraction angles is interpreted in terms of vacancies in the overlayer.

OXYGEN

FILMS

WORK FUNCTION

MONOLAYERS

CU(111)

PSEUDOPOTENTIALS

DENSITY

NA OVERLAYERS

METAL-SURFACES

SHIFTS

Författare

Marcus Breitholtz

Chalmers, Teknisk fysik, Fasta tillståndets fysik

Vasile Chis

Göteborgs universitet

Bo Hellsing

Göteborgs universitet

Stig-Åke Lindgren

Chalmers, Teknisk fysik, Fasta tillståndets fysik

Lars Erik Gustaf Wallden

Chalmers, Teknisk fysik

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 75 9-

Ämneskategorier

Annan teknik

DOI

10.1103/PhysRevB.75.155403