Carrier Dynamics and Transient Photobleaching in Thin Layers of Black Phosphorus

Abstract

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

References in corpus (13)

• Black phosphorus field-effect transistors
• High-mobility transport anisotropy and linear dichroism in few-layer black phosphorus
• Rediscovering Black Phosphorus: A Unique Anisotropic 2D Material for Optoelectronics and Electronics
• Tunable Band Gap and Anisotropic Optical Response in Few-layer Black Phosphorus
• Fast and broadband photoresponse of few-layer black phosphorus field-effect transistors
• Isolation and characterization of few-layer black phosphorus
• Tunable optical properties of multilayers black phosphorus thin films
• A black phosphorus photo-detector for multispectral, high-resolution imaging
• High Mobility WSe2 p- and n-Type Field Effect Transistors Contacted by Highly Doped Graphene for Low-Resistance Contacts
• Black phosphorus a new saturable absorber material for ultrashort pulse generation
• Dynamical Evolution of Anisotropic Response in Black Phosphorus under Ultrafast Photoexcitation
• Epitaxial Growth of Large Area Single-Crystalline Few-Layer MoS2 with Room Temperature Mobility of 192 cm2V-1s-1
• Microscopic description of intraband absorption in graphene: the occurrence of transient negative differential transmission

Cited by in corpus (6)

• Spatial-Temporal Imaging of Anisotropic Photocarrier Dynamics in Black Phosphorus
• Mid-infrared time-resolved photoconduction in black phosphorus
• Accessing the anisotropic non-thermal phonon populations in black phosphorus
• Anisotropic Nonequilibrium Lattice Dynamics of Black Phosphorus
• Probing the Free-carrier Absorption in Multi-Layer Black Phosphorus
• Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system