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

Marcus Breitholtz (Institutionen för teknisk fysik, Fasta tillståndets fysik) ; Vasile Chis ; Bo Hellsing ; Stig-Åke Lindgren (Institutionen för teknisk fysik, Fasta tillståndets fysik) ; Lars Wallden (Institutionen för teknisk fysik)
Physical Review B (1098-0121). Vol. 75 (2007), 15, p. 9.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: METAL-SURFACES, NA OVERLAYERS, WORK FUNCTION, CU(111), PSEUDOPOTENTIALS, MONOLAYERS, DENSITY, SHIFTS, OXYGEN, FILMS



Denna post skapades 2008-11-07. Senast ändrad 2008-11-12.
CPL Pubid: 77279

 

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Institutionen för teknisk fysik, Fasta tillståndets fysik (2005-2015)
Institutionen för fysik (GU) (GU)
Institutionen för teknisk fysik (1900-2015)

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Chalmers infrastruktur