1.
Phys Rev Lett
; 87(27 Pt 1): 276801, 2001 Dec 31.
Artigo
em Inglês
| MEDLINE
| ID: mdl-11800905
RESUMO
The electronic structure and morphology of ultrathin MgO films epitaxially grown on Ag(001) were investigated using low-temperature scanning tunneling spectroscopy and scanning tunneling microscopy. Layer-resolved differential conductance (dI/dU) measurements reveal that, even at a film thickness of three monolayers, a band gap of about 6 eV is formed corresponding to that of the MgO(001) single-crystal surface. This finding is confirmed by layer-resolved calculations of the local density of states based on density functional theory.