Transmission pump-probe spectroscopy on multilayer black phosphorus

Published/Posted: March 1, 2016

Authors: R. J. Suess, M. M. Jadidi, T. E. Murphy and M. Mittendorff

Abstract: Black phosphorus is a two-dimensional material that has recently attracted interest due to its high mobility and direct bandgap. In this work we examine the pump-induced change in optical transmission of mechanically exfoliated black phosphorus flakes using a two-color optical pump-probe measurement. The time-resolved data reveal a fast pump-induced transparency accompanied by a slower absorption that we attribute to Pauli blocking and free-carrier absorption, respectively. Polarization studies show that these effects are also highly anisotropic - underscoring the importance of crystal orientation in the design of optical devices based on this material. Ongoing work suggests that exploring the carrier density dependence of the pump-probe signals, which can be accessed experimentally via electrostatic gating, may allow for improved understanding of the optical response and carrier dynamics in the material.

Citation:
R. J. Suess, M. M. Jadidi, T. E. Murphy and M. Mittendorff, "Transmission pump-probe spectroscopy on multilayer black phosphorus", APS March Meeting, Baltimore, MD (USA) BAPS.2016.MAR.L16.8 (2016)