Electronic and optical properties of a nanographite ribbon in an electric field

Through the tight-binding model, the effect of electric field on electronic and optical properties of a zigzag (an armchair) H-terminated nanographite ribbon is studied. The effective electric field shifts the Fermi level ( E F), modifies the energy dispersions, alters the subband spacing, produces...

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Bibliographic Details
Published inCarbon (New York) Vol. 44; no. 3; pp. 508 - 515
Main Authors Chang, C.P., Huang, Y.C., Lu, C.L., Ho, J.H., Li, T.S., Lin, M.F.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.03.2006
Elsevier Science
Subjects
Absorption
Cross-disciplinary physics: materials science; rheology
Electronic properties
Exact sciences and technology
Fullerenes and related materials; diamonds, graphite
Graphite
Materials science
Modeling
Physics
Specific materials
Electronic properties
Absorption
Modeling
Graphite
Binding
Density of states
Semiconductor materials
Dispersions
Lift
Energy gap
Energy
Fermi level
Electric field effects
Transition elements
Optical properties
Frequency
Models
Structure
Electric fields
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Summary:Through the tight-binding model, the effect of electric field on electronic and optical properties of a zigzag (an armchair) H-terminated nanographite ribbon is studied. The effective electric field shifts the Fermi level ( E F), modifies the energy dispersions, alters the subband spacing, produces the new edge state, changes the band gap, and causes the semiconductor–metal transitions. First, in the metallic zigzag ribbon, the degeneracy of flat bands at E F is lifted by the electric field. Meanwhile, an energy band gap E g, depending on the ribbon width and the field strength, is induced. And while the field strength increases, the semiconductor–metal transition occurs in both the semiconducting armchair and the zigzag ribbons. Then, the effect of electric field on band structures is completely reflected in the features of density of states—the shift of peak position, the change of peak height and the alternation of band gap. Most importantly, the effective electric field has great influence on the low-energy absorption spectra. It can change frequency of the first peak, alter the peak height, and even produce the new peaks.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2005.08.009