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Article
Open AccessLayer-dependent exciton polarizability and the brightening of dark excitons in few-layer black phosphorus
The evolution of excitons from 2D to 3D is of great importance in photo-physics, yet the layer-dependent exciton polarizability hasn’t been investigated in 2D semiconductors. Here, we determine the exciton pol...
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Article
Open AccessPrediction of hyperbolic exciton-polaritons in monolayer black phosphorus
Hyperbolic polaritons exhibit large photonic density of states and can be collimated in certain propagation directions. The majority of hyperbolic polaritons are sustained in man-made metamaterials. However, n...
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Article
Open AccessPlasmons in the van der Waals charge-density-wave material 2H-TaSe2
Plasmons in two-dimensional (2D) materials beyond graphene have recently gained much attention. However, the experimental investigation is limited due to the lack of suitable materials. Here, we experimentally...
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Article
Open AccessThe optical conductivity of few-layer black phosphorus by infrared spectroscopy
The strength of light-matter interaction is of central importance in photonics and optoelectronics. For many widely studied two-dimensional semiconductors, such as MoS2, the optical absorption due to exciton reso...
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Article
Open AccessVan der Waals thin films of WTe2 for natural hyperbolic plasmonic surfaces
A hyperbolic plasmonic surface supports highly directional propagating polaritons with extremely large density of states. Such plasmon polaritons have been realized in artificially structured metasurfaces. How...
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Article
Open AccessStrain-tunable van der Waals interactions in few-layer black phosphorus
Interlayer interactions in 2D materials, also known as van der Waals (vdWs) interactions, play a critical role in the physical properties of layered materials. It is fascinating to manipulate the vdWs interact...
