Conference item
Mapping the temperature dependent surface states of Bi2Te3 topological insulator flakes by ultra-cryogenic terahertz near-field nanoscopy
- Abstract:
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Topological insulators (TIs) have drawn considerable attention for next generation high sensitivity, high efficiency devices thanks to their unique metallic surface conductivity via their topologically-protected surface states (TSSs). In this study, we utilized near-field nanoimaging and nanoscale spectroscopy in the Terahertz (THz) frequency range to explore the optical response of the surface layer from Bi2Te3 TI flakes. In all cases, we observe a higher near-field optical response from the TI flakes compared to a Si substrate. This contrast increases for more surface sensitive probing, which indicates the presence of a conductive surface state. In addition, we have performed temperature dependent THz nanoscopy and demonstrate a significantly enhanced near-field contrast for the TI flake at a sample temperature of 8.9 K compared to the Si substrate. This temperature-dependent behavior provides vital insight into the underlying mechanisms behind the observed conductive surface state in TI materials.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Accepted manuscript, pdf, 1.6MB, Terms of use)
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- Publisher copy:
- 10.1109/irmmw-thz61557.2025.11319616
Authors
- Publisher:
- IEEE
- Host title:
- 2025 50th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
- Publication date:
- 2026-01-14
- Acceptance date:
- 2026-01-14
- Event title:
- 50th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2025)
- Event location:
- Helsinki, Finland
- Event website:
- https://www.irmmw-thz.org/conferences/irmmw-thz-2025/
- Event start date:
- 2025-08-17
- Event end date:
- 2025-08-23
- DOI:
- EISSN:
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2162-2035
- ISSN:
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2162-2027
- EISBN:
- 9798350378832
- ISBN:
- 9798350378849
- Language:
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English
- Keywords:
- Pubs id:
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2377318
- Local pid:
-
pubs:2377318
- Deposit date:
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2026-02-23
- ARK identifier:
Terms of use
- Copyright holder:
- IEEE
- Copyright date:
- 2025
- Rights statement:
- Copyright © 2025, IEEE
- Notes:
- The author accepted manuscript (AAM) of this paper has been made available under the University of Oxford's Open Access Publications Policy, and a CC BY public copyright licence has been applied.
- Licence:
- CC Attribution (CC BY)
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