SPIN CORRELATION-EFFECTS ON THE BONDING CHARACTER OF ALKALI SILICON INTERFACES - AN EXTENDED HUBBARD-MODEL

Authors
LOPEZSANCHO JM REFOLIO MC LOPEZSANCHO MP RUBIO J
Citation
Jm. Lopezsancho et al., SPIN CORRELATION-EFFECTS ON THE BONDING CHARACTER OF ALKALI SILICON INTERFACES - AN EXTENDED HUBBARD-MODEL, Journal of vacuum science & technology. A. Vacuum, surfaces, and films, 11(5), 1993, pp. 2483-2486
Citations number
27
Categorie Soggetti
Physics, Applied
Journal title
Journal of vacuum science & technology. A. Vacuum, surfaces, and films → ACNP
ISSN journal
07342101
Volume
11
Issue
5
Year of publication
1993
Pages
2483 - 2486
Database
ISI
SICI code
0734-2101(1993)11:5<2483:SCOTBC>2.0.ZU;2-B
Abstract
Recent calculations strongly suggest assuming an antiferromagnetic spi n arrangement for the Si(100)-(2x1) reconstructed surface. The implica tions of this assumption for the alkali-covered surface are here studi ed by means of an extended Hubbard model. Whereas the substrate underg oes a gradual insulator-to-conductor transition with increasing covera ge, the adlayer suddenly metallizes above a critical coverage value. R ecent core-level data are not incompatible, as previously believed, wi th an ionic bond description of this interface.