Zone-boundary phonon induced mini band gap formation in graphene

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KANDEMİR B. S., MOĞULKOÇ A.

SOLID STATE COMMUNICATIONS, cilt.177, ss.80-83, 2014 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 177
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.ssc.2013.09.012
  • Dergi Adı: SOLID STATE COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.80-83
  • Anahtar Kelimeler: Graphene, Electron-phonon interaction, Band gap formation, METALLIC CARBON NANOTUBES, ELECTRICAL-CONDUCTIVITY, LATTICE DISTORTION, MAGNETIC-FIELDS, UNIAXIAL STRAIN, INSTABILITY
  • Ankara Üniversitesi Adresli: Evet

Özet

We investigate the effect of electron-A(1g) phonon coupling on the gapless electronic band dispersion of the pristine graphene. The electron-phonon interaction is introduced through a Kekule-type distortion giving rise to inter-valley scattering between K and K' points in graphene. We develop a Frohlich type Hamiltonian within the continuum model in the long-wave length limit. By presenting a fully theoretical analysis, we show that the interaction of charge carriers with the highest frequency zone-boundary phonon mode of A(1g) symmetry induces a mini band gap at the corners of the two-dimensional Brillouin zone of the graphene in the THz region. Since electron-electron interactions favor this type of lattice distortion, it is expected to be enhanced, and thus its quantitative implications might be measurable in graphene. (C) 2013 Elsevier Ltd. All rights reserved.