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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/9489

    Title: Tuning of graphene nanoribbon Landau levels by a nanotube
    Authors: 李道聖
    T S Li1;M F Lin;S C Chang
    Contributor: 電機工程系
    Date: 2009-12-21
    Issue Date: 2010-03-22 16:10:19 (UTC+8)
    Abstract: We investigate theoretically the effects of a nanotube on the graphene nanoribbon Landau level
    spectrum utilizing the tight-binding model. The addition of a nanotube changes the original
    dispersionless Landau subbands into distorted parabolic ones, creates additional band-edge
    states, and modifies the subband spacings. Moreover, the dispersion relations rely sensitively on
    the nanotube location. The nanotube–ribbon couplings disrupt the Landau wavefunctions and
    lift their spatial symmetry, which will change the selection rule of optical transitions. The
    numbers, frequencies and heights of the density of states (DOS) peaks are found to be strongly
    dependent on the magnetic flux density and the nanotube location. The evolution of the DOS
    peak with the magnetic flux density is explored. The graphene nanoribbon Landau levels are
    shown to be modified in an unexpected fashion by the nanotube–ribbon interactions. These
    predictions can be validated by measuring the spectra of scanning tunneling experiments or
    magneto-optical experiments, and they are most observable by placing the nanotube at the
    electron wavefunction localization sites.
    Relation: J. Phys.: Condens. Matter 21 (2009) 435302 (6pp)
    Appears in Collections:[電機工程系所] 期刊論文

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