Review Article


2016, 9(12): 3559–3597


Lattice vibrations and Raman scattering in two-dimensional layered materials beyond graphene

Xin Lu1,§, Xin Luo2,3,§, Jun Zhang4, Su Ying Quek2,3 (*), and Qihua Xiong1,5 (*)

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1 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
2 Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
3 Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
4 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083,China
5 NOVITAS, Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University,Singapore 639798, Singapore
§ These authors contributed equally to this work.

Keywords: phonon,lattice vibration,Raman spectroscopy,two-dimensional,transition metaldichalcogenide,black phosphorus
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  • Abstract
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ABSTRACT We review lattice vibrational modes in atomically thin two-dimensional (2D) layered materials, focusing on 2D materials beyond graphene, such as group VI transition metal dichalcogenides, topological insulator bismuth chalcogenides, and black phosphorus. Although the composition and structure of those materials are remarkably different, they share a common and important feature, i.e., their bulk crystals are stacked via van der Waals interactions between “layers”, while each layer is comprised of one or more atomic planes. First, we review the background of some 2D materials (MX2, M = Mo, W; X = S, Se, Te. Bi2X3, X = Se, Te. Black phosphorus), including crystalline structures and stacking order. We then review the studies on vibrational modes of layered materials and nanostructures probed by the powerful yet nondestructive Raman spectroscopy technique. Based on studies conducted before 2010, recent investigations using more advanced techniques have pushed the studies of phonon modes in 2D layered materials to the atomically thin regime, down to monolayers. We will classify the recently reported general features into the following categories: phonon confinement effects and electron–phonon coupling, anomalous shifts in high-frequency intralayer vibrational modes and surface effects, reduced dimensionality and lower symmetry, the linear chain model and the substrate effect, stacking orders and interlayer shear modes, polarization dependence, and the resonance effect. Within the seven categories, both intralayer and interlayer vibrational modes will be discussed. The comparison between different materials will be provided as well.
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Lattice vibrations and Raman scattering in two-dimensional layered materials beyond graphene. Nano Res. 2016, 9(12): 3559–3597

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