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Subsurface impurities and vacancies in a three-dimensional topological insulator
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2012 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 86, no 11, 115433- p.Article in journal (Refereed) Published
Abstract [en]

Using a three-dimensional microscopic lattice model of a strong topological insulator (TI) we study potential impurities and vacancies in surface, subsurface, and bulk positions. For all impurity locations we find impurity-induced resonance states with energy proportional to the inverse of the impurity strength, although the impurity strength needed for a low-energy resonance state increases with the depth of the impurity. For strong impurities and vacancies as deep as 15 layers into the material, resonance peaks will appear at and around the Dirac point in the surface energy spectrum, splitting the original Dirac point into two nodes located off-center. Furthermore, we study vacancy clusters buried deep inside the bulk and find zero-energy resonance states for both single and multiple-site vacancies. Only fully symmetric multiple-site vacancy clusters show resonance states expelled from the bulk

Place, publisher, year, edition, pages
2012. Vol. 86, no 11, 115433- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-183747DOI: 10.1103/PhysRevB.86.115433ISI: 000309173300006OAI: oai:DiVA.org:uu-183747DiVA: diva2:564942
Available from: 2012-11-05 Created: 2012-11-01 Last updated: 2012-11-05Bibliographically approved

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Black-Schaffer, Annica M.
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