Knox, C.S. orcid.org/0000-0002-4673-5649, Vaughan, M.T. orcid.org/0000-0002-8336-2183, Fox, N.R. et al. (6 more authors) (2024) Optical Conductivity of a Bi₂Se₃ Topological Insulator with a THz Transparent Top Gate. Nanophotonics, 13 (10). pp. 1843-1850. ISSN 2192-8606
Abstract
We have performed an investigation into the optical conductivity and magnetotransport properties of top-gated devices patterned on the topological insulator Bi2Se3 in order to determine the relative effects of the different carrier species that exist within these novel materials. We find that the topologically protected surfaces within our samples are partially screened from the action of the gate by trivial band-bending states formed at the top surface of the topological insulator. Despite this, the mobility of the topological surface carriers is significantly affected by the application of an external gate bias. Additionally, we find that the optical conductivity response is dominated by the topologically protected surface states, and that the optical conductivity is particularly sensitive to the scattering caused by the topological surfaces coupling to trivial states, arising from the bulk or band-bending induced surface states. These results will have interesting applications to the design of future plasmonic devices that incorporate topological materials.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 the author(s), published by De Gruyter. This work is licensed under the Creative Commons Attribution 4.0 International License. |
Keywords: | topological insulators; THz time domain spectroscopy; quantum transport |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/V001914/1 EU - European Union 964735 EPSRC (Engineering and Physical Sciences Research Council) EP/P022464/1 EPSRC (Engineering and Physical Sciences Research Council) EP/R00661X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Jan 2024 14:17 |
Last Modified: | 23 Jan 2025 09:34 |
Status: | Published |
Publisher: | De Gruyter |
Identification Number: | 10.1515/nanoph-2023-0690 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:208072 |