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    Aharonov–Bohm interference in topological insulator nanoribbons

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    Type
    Article
    Authors
    Peng, Hailin
    Lai, Keji
    Kong, Desheng
    Meister, Stefan
    Chen, Yulin
    Qi, Xiao-Liang
    Zhang, Shou-Cheng
    Shen, Zhi-Xun
    Cui, Yi cc
    KAUST Grant Number
    KUS-l1-001-12
    KUS-F1-033-02
    Date
    2009-12-13
    Online Publication Date
    2009-12-13
    Print Publication Date
    2010-03
    Permanent link to this record
    http://hdl.handle.net/10754/597479
    
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    Abstract
    Topological insulators represent unusual phases of quantum matter with an insulating bulk gap and gapless edges or surface states. The two-dimensional topological insulator phase was predicted in HgTe quantum wells and confirmed by transport measurements. Recently, Bi2 Se3 and related materials have been proposed as three-dimensional topological insulators with a single Dirac cone on the surface, protected by time-reversal symmetry. The topological surface states have been observed by angle-resolved photoemission spectroscopy experiments. However, few transport measurements in this context have been reported, presumably owing to the predominance of bulk carriers from crystal defects or thermal excitations. Here we show unambiguous transport evidence of topological surface states through periodic quantum interference effects in layered single-crystalline Bi2 Se3 nanoribbons, which have larger surface-to-volume ratios than bulk materials and can therefore manifest surface effects. Pronounced Aharonov-Bohm oscillations in the magnetoresistance clearly demonstrate the coherent propagation of two-dimensional electrons around the perimeter of the nanoribbon surface, as expected from the topological nature of the surface states. The dominance of the primary h/e oscillation, where h is Plancks constant and e is the electron charge, and its temperature dependence demonstrate the robustness of these states. Our results suggest that topological insulator nanoribbons afford promising materials for future spintronic devices at room temperature.
    Citation
    Peng H, Lai K, Kong D, Meister S, Chen Y, et al. (2009) Aharonov–Bohm interference in topological insulator nanoribbons. Nat Mater. Available: http://dx.doi.org/10.1038/NMAT2609.
    Sponsors
    We would like to thank D. Goldhaber-Gordon, K. A. Moler, J. Analytis and J. Maciejko for the helpful discussion. Y.C. acknowledges the support from the King Abdullah University of Science and Technology (KAUST) Investigator Award (No. KUS-l1-001-12). H. P. acknowledges the support from MOST (2007CB936203). K. L. acknowledges the KAUST Postdoctoral Fellowship support No. KUS-F1-033-02. Y.L.C. and Z.X.S. acknowledge the support from the Department of Energy, Office of Basic Energy Sciences under contract DE-AC02-76SF00515.
    Publisher
    Springer Nature
    Journal
    Nature Materials
    DOI
    10.1038/NMAT2609
    PubMed ID
    20010826
    ae974a485f413a2113503eed53cd6c53
    10.1038/NMAT2609
    Scopus Count
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