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Paper   IPM / Nano-Sciences / 11673
School of Nano Science
  Title:   Linear optical response of carbon nanotubes under axial magnetic field
1.  Rostam Moradian
2.  R. Chegel
3.  S. Behzadi
  Status:   Published
  Journal: Physica E
  No.:  6
  Vol.:  42
  Year:  2010
  Pages:   10
  Publisher(s):   ElsevierB.V.
  Supported by:  IPM
We considered single walled carbon naotubes (SWCNTs) as real three dimensional (3D) systems in a cylindrical coordinate. The optical matrix elements and linear susceptibility, χ(ω), in the tight binding approximation in terms of one-dimensional wave vector, kz and subband index, l are calculated. In an external axial magnetic field optical frequency dependence of linear susceptibility are investigated. We found that axial magnetic field has two effects on the imaginary part of the linear susceptibility spectrum, in agreement with experimental results. The first effect is broadening and the second, splitting. Also we found that for all metallic zigzag and armchair SWCNTs, the axial magnetic field leads to the creation of a peak with energy less than 1.5 eV, contrary to what is observed in the absence of a magnetic field.

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