Title
Accurate description of the van der Waals interaction of an electron-positron pair with the surface of a topological insulator
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Sciences. Physics
Publication type
conferenceObject
Publication
Bristol ,
Subject
Physics
Chemistry
Source (journal)
Journal of physics : conference series. - Bristol
Volume/pages
505(2014) , 4 p.
ISSN
1742-6588
Article Reference
012002
ISI
000338216500002
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Positrons can be trapped in localized states at the surface of a material, and thus quite selectively interact with core or valence surface electrons. Hence, advanced surface positron spectroscopy techniques can present the ideal tools to study a topological insulator, where surface states play a fundamental role. We analyze the problem of a positron at a TI surface, assuming that it is a weakly physisorbed positronium (Ps) atom. To determine if the surface of interest in a material can sustain such a physisorption, an accurate description of the underlying van der Waals (vdW) interaction is essential. We have developed a first-principles parameterfree method, based on the density functional theory, to extract key parameters determining the vdW interaction potential between a Ps atom and the surface of a given material. The method has been successfully applied to quartz and preliminary results on Bi2Te2Se indicate the existence of a positron surface state. We discuss the robustness of our predictions versus the most relevant approximations involved in our approach.
E-info
https://repository.uantwerpen.be/docman/iruaauth/02ae8a/364a82bb100.pdf
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