In-plane anisotropic optical and mechanical properties of two-dimensional MoO${}_3$

Abstract

Molybdenum trioxide (MoO${}_3$) in-plane anisotropy has increasingly attracted the attention of the scientific community in the last few years. Many of the observed in-plane anisotropic properties stem from the anisotropic refractive index and elastic constants of the material but a comprehensive analysis of these fundamental properties is still lacking. Here we employ Raman and micro-reflectance measurements, using polarized light, to determine the angular dependence of the refractive index of thin MoO${}_3$ flakes and we study the directional dependence of the MoO${}_3$ Young's modulus using the buckling metrology method. We found that MoO${}_3$ displays one of the largest in-plane anisotropic mechanical properties reported for 2D materials so far.

4 figures in main text. 6 figures in supp. info

References in corpus (8)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Broadband Linear-Dichroic Photodetector in a Black Phosphorus Vertical p-n Junction
• Superior mechanical flexibility of phosphorene and few-layer black phosphorus
• Many-body perturbation theory calculations using the yambo code
• Configure polaritons in twisted $\alpha$-MoO3
• Micro-reflectance and transmittance spectroscopy: a versatile and powerful tool to characterize 2D materials
• Anisotropic buckling of few-layer black phosphorus
• An inexpensive system for the deterministic transfer of 2D materials

Cited by in corpus (2)

• Optical and dielectric properties of MoO${}_3$ nanosheets for van der Waals heterostructures
• Room temperature quantum emitters in van der Waals α-MoO3