Photoelectric properties of monolayer black phosphorus in visible regime at room temperature

In the present study, we theoretically study the photoelectric properties in visible regime of monolayer black phosphorus at room temperature. The low energy k·p method is applied to study the anisotropic band structure of monolayer black phosphorus. The energy-balance equation deduced from Boltzmann equation is used to calculate the energy transfer rate for the photon polarization at armchair and zigzag direction coupling with electrons. Then the optical conductivity and transmission coefficient as a function of wavelength are calculated for various electron densities. It is found that the optical responses of monolayer black phosphorus to the radiation field with two kinds of polarizations are anisotropic obviously. Specifically, the optical conductivity (transmission coefficient) for photon polarization at armchair direction is much larger (smaller) than that zigzag direction. We believe that the results obtained from this study can provide a guidance for novel photoelectric device applications suck like polarization detector.