THE LOW COVERAGE PHASES OF PbON Ge(001): SCANNING TUNNELING MICROSCOPY AND FIRST PRINCIPLES

Noboru Takeuchi (), G. Falkenberg and R. L. Johnson
Additional contact information
Noboru Takeuchi: Centro de Ciencias de la Materia Condensada, Universidad Nacional Autónoma de México, Apartado Postal 2681, Ensenada, Baja California, 22800, Mexico
G. Falkenberg: II. Institut fur Experimentalphysick Universitat Hamburg, Luruper Chausse 149, D-22761, Hamburg, Germany
R. L. Johnson: II. Institut fur Experimentalphysick Universitat Hamburg, Luruper Chausse 149, D-22761, Hamburg, Germany

Surface Review and Letters (SRL), 2002, vol. 09, issue 05n06, 1809-1814

Abstract: Using scanning tunneling microscopy and first principles total energy calculations, we have studied the atomic structure of the low coverage phases of Pb on Ge(001): the(2 × 2)and thec(4 × 8)- αreconstructions. Based on the analysis of the experimental bias-dependent STM images and supported by theab initiopseudopotential density-functional calculations, we present models for each structure. In both cases, there is a coexistence of Ge and Pb dimers. The(2 × 2)phase is formed by asymmetric Pb dimers parallel and in the trenches between the underlying Ge dimers. The Pb coverage is 0.5 ML and it corresponds to the maximum packing density of Pb dimers without breaking Ge dimers. Thec(4 × 8) - αreconstruction has a Pb coverage of 0.75 ML and it is characterized by asymmetric Pb dimers forming chains along the [110] direction. However, in this case half of the Ge dimers are broken. The other half remain intact and they are perpendicular to the Pb dimers.

Date: 2002
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0218625X02004499
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:srlxxx:v:09:y:2002:i:05n06:n:s0218625x02004499

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0218625X02004499

Access Statistics for this article

Surface Review and Letters (SRL) is currently edited by S Y Tong

More articles in Surface Review and Letters (SRL) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().