Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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. 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.

27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess