Intrinsic optical conductivity of modified-Dirac fermion systems

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 MoS${}_2$ and ultrathin film of the 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 ultrathin film of the topological insulator 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.

14 pages, 9 figures. To appear in Phys. Rev. B

References in corpus (7)

• The electronic properties of graphene
• Valley polarization in MoS2 monolayers by optical pumping
• Valley filter and valley valve in graphene
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• The optical conductivity of graphene in the visible region of the spectrum
• Edge states in Graphene: from gapped flat band to gapless chiral modes
• On the minimal conductivity of graphene

Cited by in corpus (7)

• Effect of Point Defects on the Optical and Transport Properties of MoS2 and WS2
• Valley Zeeman effect and spin-valley polarized conductance in monolayer MoS${}_2$ in a perpendicular magnetic field
• Anisotropic longitudinal optical conductivities of tilted Dirac bands in 1T${}^{\prime }$-MoS${}_2$
• Spin-resolved optical conductivity of two-dimensional group-VIB transition-metal dichalcogenides
• Valley- and spin-filter in monolayer MoS${}_2$
• Low-temperature thermal transport and thermopower of monolayer transition metal dichalcogenide semiconductors
• Universal absorption of two-dimensional systems