Observation of anisotropic interlayer Raman modes in few-layer ReS2

Abstract

ReS${}_2$ has recently emerged as a new member in the rapidly growing family of two-dimensional materials. Unlike MoS${}_2$ or WSe${}_2$, the optical and electrical properties of ReS${}_2$ are not isotropic due to the reduced symmetry of the crystal. Here, we present layer-dependent Raman measurements of ReS${}_2$ samples ranging from monolayers to ten layers in the ultralow frequency regime. We observe layer breathing and shear modes which allow for easy assignment of the number of layers. Polarization-dependent measurements give further insight into the crystal structure and reveal an energetic shift of the shear mode which stems from the in-plane anisotropy of the shear modulus in this material.

References in corpus (7)

• Two Dimensional Atomic Crystals
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Anomalous Lattice Vibrations of Single and Few-Layer MoS2
• Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
• Helicity resolved Raman scattering of MoS2, MoSe2, WS2 and WSe2 atomic layers
• Observation of interlayer phonon modes in van der Waals heterostructures
• Raman spectroscopy of the interlayer shear mode in few-layer MoS2 flakes

Cited by in corpus (10)

• Splitting of interlayer shear modes and photon energy dependent anisotropic Raman response in $N$-layer ReSe${}_2$ and ReS${}_2$
• Coupling and stacking order of ReS2 atomic layers revealed by ultralow-frequency Raman spectroscopy
• Polytypism and Unexpected Strong Interlayer Coupling of two-Dimensional Layered ReS2
• Direct observation of the band gap transition in atomically thin ReS${}_2$
• Stacking-Dependent Interlayer Phonons in 3R and 2H MoS${}_2$
• In-plane anisotropy in biaxial ReS2 crystals probed by nano-optical imaging of waveguide modes
• Phase Modulators Based on High Mobility Ambipolar ReSe2 Field-Effect Transistors
• Air tightness of hBN encapsulation and its impact on Raman spectroscopy of van der Waals materials
• Two-dimensional ReS2: Solution to the Unresolved Queries on Its Structure and Inter-layer Coupling Leading to Potential Optical Applications
• Light-Assisted and Gate-Tunable Oxygen Gas Sensor based on Rhenium Disulfide (ReS2) Field-Effect Transistors