Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Edge and bulk components of lowest-Landau-level orbitals, correlated
  fractional quantum Hall effect incompressible states, and insulating behavior
  in finite graphene samples   Many-body calculations of the total energy of interacting Dirac electrons in
finite graphene samples exhibit joint occurrence of cusps at angular momenta
corresponding to fractional fillings characteristic of formation of
incompressible (gapped) correlated states (nu=1/3 in particular) and opening of
an insulating energy gap (that increases with the magnetic field) at the Dirac
point, in correspondence with experiments. Single-particle basis functions
obeying the zigzag boundary condition at the sample edge are employed in exact
diagonalization of the interelectron Coulomb interaction, showing, at all
sizes, mixed equal-weight bulk and edge components. The consequent depletion of
the bulk electron density attenuates the fractional-quantum-Hall-effect
excitation energies and the edge charge accumulation results in a gap in the
many-body spectrum.

9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas