Charge Density Wave Phase Transition on the Surface of Electrostatically Doped Multilayer Graphene

We demonstrate that charge density wave (CDW) phase transition occurs on the surface of electronically doped multilayer graphene when the Fermi level approaches the M points (also known as van Hove singularities where the density of states diverge) in the Brillouin zone of graphene band structure. T...

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Bibliographic Details
Published in:arXiv.org 2016-10
Main Authors: Long, Gen, Xu, Shuigang, Zhang, Ting, Wu, Zefei, Wong, Wing Ki, Han, Tianyi, Lin, Jiangxiazi, Cai, Yuan, Wang, Ning
Format: Article
Language:English
Subjects:
Brillouin zones
Charge density waves
Graphene
Multilayers
Optical measurement
Phase transitions
Phonons
Singularities
Splitting
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Summary:We demonstrate that charge density wave (CDW) phase transition occurs on the surface of electronically doped multilayer graphene when the Fermi level approaches the M points (also known as van Hove singularities where the density of states diverge) in the Brillouin zone of graphene band structure. The occurrence of such CDW phase transitions are supported by both the electrical transport measurement and optical measurements in electrostatically doped multilayer graphene. The CDW transition is accompanied with the sudden change of graphene channel resistance at T\(_m\)= 100K, as well as the splitting of Raman G peak (1580 cm\(^{-1}\)). The splitting of Raman G peak indicats the lifting of in-plane optical phonon branch degeneracy and the non-degenerate phonon branches are correlated to the lattice reconstructions of graphene -- the CDW phase transition.
ISSN:2331-8422
DOI:10.48550/arxiv.1610.07267