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Paper   IPM / Physic / 13106
School of Physics
  Title:   Intrinsic optical conductivity of modi ed-Dirac fermion systems
  Author(s): 
1.  H. Rostami
2.  R. Asgari
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  89
  Year:  2014
  Pages:   115413
  Supported by:  IPM
  Abstract:
We analytically calculate the intrinsic longitudinal and transverse optical conductivities of electronic systems which govern by a modified-Dirac fermion model Hamiltonian for materials beyond graphene such as monolayer MoS2 and an ultrathin film of topological insulator. We analyze the effect of a topological term in the Hamiltonian on the optical conductivity and transmittance. We show that the optical response enhances in the non-trivial phase of the system and the optical Hall conductivity changes sign at transition from trivial to non-trivial phases which has significant consequences on a circular polarization and optical absorption of the system.

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