Insulators at the ultrathin limit : electronic structure studied by scanning tunnelling microscopy and scanning tunnelling spectroscopy

Schintke, Silvia (Universität Basel, Basel, Switzerland) ; Schneider, Wolf-Dieter (EPFL, Lausanne, Switzerland)

Considerable progress has been made recently, using scanning tunnelling microscopy (STM), scanning tunnelling spectroscopy (STS) and local density functional theory (DFT), in examining the atomic structure and electronic properties of ultrathin insulating films. This article reviews pertinent results to date with special emphasis on ultrathin MgO films on Ag(001) surfaces. Using STS, the layer-by-layer resolved electronic structure up to 3 ML shows that the band gap of about 6 eV at the MgO surface develops within the first 3 ML confirmed by local density of states (LDOS) calculations. Using model calculations, the atomic species observed in STM on the MgO film are unambiguously identified. These results underline the importance of a combination of local spectroscopy, scanning probe techniques and local density of states calculations for the understanding of matter on the microscopic level.


Note: SCHINTKE, Silvia est une chercheuse à la HES-SO, HEIG-VD, depuis 2002.


Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEIG-VD
Institute:
COMATEC - Institut de Conception, Matériaux, Emballage & Conditionnement
Date:
2004-01
Pagination:
33 p.
Published in:
Journal of Physics: Condensed Matter
Numeration (vol. no.):
2004, vol. 16, no. 4, pp. R49-R81
DOI:
ISSN:
0953-8984
Appears in Collection:



 Record created 2021-02-12, last modified 2021-02-19

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