Manipulating surface states in topological insulator nanoribbons
| Autor: | Xiaowei Jiang, Jin Zou, Li-Te Chang, Faxian Xiu, Liang He, Lina Cheng, G. Huang, Yi Zhou, Alexandros Shailos, Kang L. Wang, Yong Wang, Murong Lang, Zhigang Chen, Xufeng Kou |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Condensed matter physics Biomedical Engineering Quantum oscillations Bioengineering Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Gate voltage Atomic and Molecular Physics and Optics Computer Science::Hardware Architecture Computer Science::Emerging Technologies Quantum spin Hall effect Surface conduction Topological insulator Topological order General Materials Science Physics::Chemical Physics Electrical and Electronic Engineering Surface states |
| Zdroj: | Nature Nanotechnology. 6:216-221 |
| ISSN: | 1748-3395 1748-3387 |
| Popis: | 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 Bi(2)Te(3) nanoribbons. Surface conduction can be significantly enhanced by the gate voltage, with the mobility and Fermi velocity reaching values as high as ~5,800 cm(2) V(-1) s(-1) and ~3.7 × 10(5) 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. |
| Databáze: | OpenAIRE |
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