Carrier dynamics and transient photobleaching in thin layers of black phosphorus

• DOI: 10.1063/1.4929403
• Publication Date: 2015-08-24T18:03:20Z
• Authors: Ryan J. Suess; Mohammad M. Jadidi; Thomas E. Murphy; Martin Mittendorff
• Keywords: Photobleaching; Drude model

We present polarization-resolved transient transmission measurements on multi-layer black phosphorus. Background free two-color pump-probe spectroscopy are carried out mechanically exfoliated phosphorus flakes that have been transferred to a large-bandgap, silicon carbide substrate. The blue-shifted pump pulse (780 nm) induces an increased of the probe (1560 over time scale commensurate with measurement resolution (hundreds fs). After initial pump-induced transparency, sign flips and slower enhanced absorption is observed. This extended characterized by two relaxation scales 180 ps 1.3 ns. saturation peak attributed Pauli blocking while ascribed Drude response carriers. anisotropic carrier mobility in leads different weights absorption, depending polarization, which readily observed amplitude signals.