Dynamical Evolution of Anisotropic Response in Black Phosphorus under Ultrafast Photoexcitation

Abstract

Black phosphorus has recently emerged as a promising material for high performance electronic and optoelectronic device for its high mobility, tunable mid-infrared bandgap and anisotropic electronic properties. Dynamical evolution of photo excited carriers and its induced change of transient electronic properties are critical for materials' high field performance, but remains to be explored for black phosphorus. In this work, we perform angle resolved transient reflection spectroscopy to study the dynamical evolution of anisotropic properties of black phosphorus under photo excitation. We find that the anisotropy of reflectivity is enhanced in the pump induced quasi-equilibrium state, suggesting an extraordinary enhancement of the anisotropy in dynamical conductivity in hot carrier dominated regime. These results raise enormous possibilities of creating high field, angle sensitive electronic, optoelectronic and remote sensing devices exploiting the dynamical electronic anisotropic with black phosphorus.

arXiv comment22 pages,10 figures

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• Carrier Dynamics and Transient Photobleaching in Thin Layers of Black Phosphorus
• Spatial-Temporal Imaging of Anisotropic Photocarrier Dynamics in Black Phosphorus
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• Ultrafast Relaxation Dynamics of Photoexcited Dirac Fermion in The Three Dimensional Dirac Semimetal Cadmium Arsenide
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• Anisotropic Nonequilibrium Lattice Dynamics of Black Phosphorus
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• Anisotropic charge density wave in electron-hole double monolayers: Applied to phosphorene
• Non-Abelian gauge field optics in the time domain
• Non-adiabatic suppression of 3D excitonic screening in black phosphorus by mid-infrared pulses
• Mid-Infrared Ultrafast Carrier Dynamics in Thin Film Black Phosphorus