Tunable optical properties of multilayers black phosphorus thin films

摘要

Black phosphorus thin films might offer attractive alternatives to narrow gapcompound semiconductors for optoelectronics across mid- to near-infraredfrequencies. In this work, we calculate the optical conductivity tensor ofmultilayer black phosphorus thin films using the Kubo formula within aneffective low-energy Hamiltonian. The optical absorption spectra of multilayerblack phosphorus are shown to vary sensitively with thickness, doping, andlight polarization. In conjunction with experimental spectra obtained frominfrared absorption spectroscopy, we also discuss the role of interbandcoupling and disorder on the observed anisotropic absorption spectra.