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Half-filled orbital and unconventional geometry of a common dopant in Si(001)

Iwaya, K; Bowler, DR; Brazdova, V; Ferreira da Silva, A; Renner, C; Wu, W; Fisher, AJ; ... Aeppli, G; + view all (2013) Half-filled orbital and unconventional geometry of a common dopant in Si(001). PHYSICAL REVIEW B , 88 (3) , Article 035440. 10.1103/PhysRevB.88.035440. Green open access

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Abstract

The determining factor of the bulk properties of doped Si is the column rather than the row in the periodic table from which the dopants are drawn. It is unknown whether the basic properties of dopants at surfaces and interfaces, steadily growing in importance as microelectronic devices shrink, are also solely governed by their column of origin. The common light impurity P replaces individual Si atoms and maintains the integrity of the dimer superstructure of the Si(001) surface, but loses its valence electrons to surface states. Here we report that isolated heavy dopants are entirely different: Bi atoms form pairs with Si vacancies, retain their electrons, and have highly localized, half-filled orbitals.

Type: Article
Title: Half-filled orbital and unconventional geometry of a common dopant in Si(001)
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.88.035440
Publisher version: http://dx.doi.org/10.1103/PhysRevB.88.035440
Language: English
Additional information: This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1399169
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