Manipulating surface states in topological insulator nanoribbons
Article
Article Title | Manipulating surface states in topological insulator nanoribbons |
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ERA Journal ID | 34328 |
Article Category | Article |
Authors | Xiu, Faxian (Author), He, Liang (Author), Wang, Yong (Author), Cheng, Lina (Author), Chang, Li Te (Author), Lang, Murong (Author), Huang, Guan (Author), Kou, Xufeng (Author), Zhou, Yi (Author), Jiang, Xiaowei (Author), Chen, Zhigang (Author), Zou, Jin (Author), Shailos, Alexandros (Author) and Wang, Kang L. (Author) |
Journal Title | Nature Nanotechnology |
Journal Citation | 6 (4), pp. 216-221 |
Number of Pages | 6 |
Year | 2011 |
Place of Publication | United KIngdom |
ISSN | 1748-3387 |
1748-3395 | |
Digital Object Identifier (DOI) | https://doi.org/10.1038/nnano.2011.19 |
Web Address (URL) | https://www.nature.com/articles/nnano.2011.19 |
Abstract | Topological insulators display unique properties, such as the quantum spin Hall effect, because time-reversal symmetry allows charges and spins to propagate along the edge or surface of the topological insulator without scattering. However, the direct manipulation of these edge/surface states is difficult because they are significantly outnumbered by bulk carriers. Here, we report experimental evidence for the modulation of these surface states by using a gate voltage to control quantum oscillations in Bi2 Te3 nanoribbons. Surface conduction can be significantly enhanced by the gate voltage, with the mobility and Fermi velocity reaching values as high as ∼5,800 cm2 V-1 s -1 and ∼3.7×105 m s-1, respectively, with up to ∼51% of the total conductance being due to the surface states. We also report the first observation of h/2e periodic oscillations, suggesting the presence of time-reversed paths with the same relative zero phase at the interference point. The high surface conduction and ability to manipulate the surface states demonstrated here could lead to new applications in nanoelectronics and spintronics. |
Keywords | biophysics, bioengineering and medical instrumentation |
ANZSRC Field of Research 2020 | 510502. Medical physics |
510501. Biological physics | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of California, United States |
University of Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4195/manipulating-surface-states-in-topological-insulator-nanoribbons
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