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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/3812


    Title: Electronic and optical properties of a nanographite ribbon in an electric field
    Authors: ChangC.P.
    HuangY.C.
    LuC.L.
    HoJ.H.
    LiT.S. (李道聖)
    LinM.F.
    Keywords: Graphite
    Modeling
    Electronic properties
    Absorption
    Date: 2005-09-30
    Issue Date: 2009-08-15 19:49:52 (UTC+8)
    Abstract: Through the tight-binding model, the effect of electric field on electronic and optical properties of a zigzag (an armchair) H-terminatednanographite ribbon is studied. The effective electric field shifts the Fermi level (EF), modifies the energy dispersions, alters the subbandspacing, produces the new edge state, changes the band gap, and causes the semiconductor–metal transitions. First, in the metallic zigzagribbon, the degeneracy of flat bands at EF is lifted by the electric field. Meanwhile, an energy band gap Eg, depending on the ribbon widthand the field strength, is induced. And while the field strength increases, the semiconductor–metal transition occurs in both the semiconductingarmchair and the zigzag ribbons. Then, the effect of electric field on band structures is completely reffected in the features ofdensity of states—the shift of peak position, the change of peak height and the alternation of band gap. Most importantly, the effectiveelectric field has great influence on the low-energy absorption spectra. It can change frequency of the first peak, alter the peak height, andeven produce the new peaks.
    Relation: Carbon, v. 44, 2006, p. 508-515
    Appears in Collections:[電機工程系所] 期刊論文

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