Coupling and stacking order of ReS2 atomic layers revealed by ultralow-frequency Raman spectroscopy

Abstract

We investigate the ultralow-frequency Raman response of atomically thin ReS2, a special type of two-dimensional (2D) semiconductors with unique distorted 1T structure. Bilayer and few-layer ReS2 exhibit rich Raman spectra at frequencies below 50 cm-1, where a panoply of interlayer shear and breathing modes are observed. The emergence of these interlayer phonon modes indicate that the ReS2 layers are coupled and stacked orderly, in contrast to the general belief that the ReS2 layers are decoupled from one another. While the interlayer breathing modes can be described by a linear chain model as in other 2D layered crystals, the shear modes exhibit distinctive behavior due to the in-plane lattice distortion. In particular, the two shear modes in bilayer ReS2 are non-degenerate and well separated in the Raman spectrum, in contrast to the doubly degenerate shear modes in other 2D materials. By carrying out comprehensive first-principles calculations, we can account for the frequency and Raman intensity of the interlayer modes, and determine the stacking order in bilayer ReS2.

References in corpus (10)

• 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
• Observation of Low-frequency Interlayer Breathing Modes in Few-layer Black Phosphorus
• Observation of out-of-plane vibrations in few-layer graphene
• Layer breathing modes in few-layer graphene
• Large Frequency Change with Thickness in Interlayer Breathing Mode - Significant Interlayer Interactions in Few Layer Black Phosphorus
• Temperature-activated layer-breathing vibrations in few-layer graphene
• Observation of anisotropic interlayer Raman modes in few-layer ReS2
• Stacking-dependent shear modes in trilayer graphene

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• Interlayer bond polarizability model for stacking-dependent low-frequency Raman scattering in layered materials
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• Doping controlled Fano resonance in bilayer 1T${}^{\prime }$-ReS${}_2$: Raman experiments and first-principles theoretical analysis