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Protection of surface states in topological nanoparticles

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Title: Protection of surface states in topological nanoparticles
Authors: Siroki, G
Haynes, PD
Lee, DKK
Giannini, V
Item Type: Journal Article
Abstract: opological insulators host protected electronic states at their surface. These states show little sensitivity to disorder. For miniaturization one wants to exploit their robustness at the smallest sizes possible. This is also beneficial for optical applications and catalysis, which favor large surface-to-volume ratios. However, it is not known whether discrete states in particles share the protection of their continuous counterparts in large crystals. Here we study the protection of the states hosted by topological insulator nanoparticles. Using both analytical and tight-binding simulations, we show that the states benefit from the same level of protection as those on a planar surface. The results hold for many shapes and sustain surface roughness which may be useful in photonics, spectroscopy, and chemistry. They complement past studies of large crystals—at the other end of possible length scales. The protection of the nanoparticles suggests that samples of all intermediate sizes also possess protected states.
Issue Date: 20-Jul-2017
Date of Acceptance: 18-Nov-2016
URI: http://hdl.handle.net/10044/1/54472
DOI: https://dx.doi.org/10.1103/PhysRevMaterials.1.024201
ISSN: 2475-9953
Publisher: American Physical Society
Journal / Book Title: Physical Review Materials
Volume: 1
Issue: 2
Copyright Statement: © 2017 American Physical Society
Publication Status: Published
Article Number: 024201
Appears in Collections:Condensed Matter Theory
Faculty of Natural Sciences