Resonant Low Frequency Interlayer Shear Modes in Folded Graphene Layers

Abstract

Naturally or artificially stacking extra layers on single layer graphene (SLG) forms few-layer graphene (FLG), which has attracted tremendous attention owing to its exceptional properties inherited from SLG and new features generated by introducing extra freedom. In FLG, shear modes play a critical role in understanding its distinctive properties. Unfortunately, energies of shear modes are so close to excitation lasers to be fully blocked by a Rayleigh rejecter. This greatly hinders investigations of shear modes in FLG. Here, we demonstrate dramatically enhanced shear modes in properly folded FLG. Benefiting from the extremely strong signals, for the first time, enhancement mechanism, vibrational symmetry, anharmonicity and electron-phonon coupling (EPC) of shear modes are uncovered through studies of two-dimensional (2D) Raman mapping, polarization- and temperature-dependent Raman spectroscopy. This work complements Raman studies of graphene layers, and paves an efficient way to exploit low frequency shear modes of FLG and other 2D layered materials.

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Cited by in corpus (15)

• Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
• The Interlayer Shear Modes in Twisted Multi-layer Graphenes: Interlayer coupling, Davydov Splitting and Intensity Resonance
• Observation of interlayer phonon modes in van der Waals heterostructures
• Interlayer electronic hybridization leads to exceptional thickness-dependent vibrational properties in few-layer black phosphorus
• Coupling and stacking order of ReS2 atomic layers revealed by ultralow-frequency Raman spectroscopy
• Interface coupling in twisted multilayer graphene by resonant Raman spectroscopy of layer breathing modes
• Electronic and optical properties of graphene nanoribbons in external fields
• Temperature-activated layer-breathing vibrations in few-layer graphene
• Stacking-dependent shear modes in trilayer graphene
• THz excitations in α-RuCl3: Majorana fermions, rigid-plane shear and compression modes
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• Low-frequency phonons of few-layer graphene within a tight-binding model
• Van der Waals interlayer potential of graphitic structures: from Lennard-Jones to Kolmogorov-Crespy and Lebedeva models
• Minimal Chimera States in Phase-Lag Coupled Mechanical Oscillators
• The Effects of Free Edge Interaction-Induced Knotting on the Buckling of Monolayer Graphene