Lattice Vibrational Modes

Lattice vibrations in layered materials are categorized into intra- and inter-layer vibrations depending on the relative lattice displacement. The quanta of lattice vibrations are referred as phonons. A phonon is a collective excitation in a periodic material. We are interested to study the phononic properties in low-dimensional materials by using low-frequency (for interlayer coupling) and polarization-resolved (e.g. for chiral phonon) Raman spectroscopy.

Intralayer and Interlayer vibrational modes in layered materials [1]

Intralayer and Interlayer vibrational modes in layered materials [1]

Polarization-resolved, low frequency Raman spectroscopy [2]

Polarization-resolved, low frequency Raman spectroscopy [2]

[1]  Xin Lu*, Xin Luo*, Jun Zhang, Su Ying Quek, and Qihua Xiong. Lattice vibrations and Raman scattering in two-dimensional layered materials beyond graphene. Nano Res. (Invited Review), 9 (12), 3559-3597, 2016.

[2]  Xin Lu, M. Iqbal Bakti Utama, Junhao Lin, Xin Luo, Yanyuan Zhao, Jun Zhang, Sokrates T. Pantelides, Wu Zhou, Su Ying Quek, and Qihua Xiong. Rapid and Nondestructive Identification of Polytypism and Stacking Sequences in Few-layer Molybdenum Diselenide by Raman Spectroscopy. Adv. Mater. 27 (30), 4502-4508, 2015.

[3] Xin Lu*, M. Iqbal Bakti Utama*, Xingzhi Wang, Weigao Xu, Weijie Zhao, Man Hon Samuel Owen and Qihua Xiong. Gate‐Tunable Resonant Raman Spectroscopy of Bilayer MoS2. Small, 13 (35), 1701039, 2017.