Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductor-insulator transition of Josephson-junction arrays on a
  honeycomb lattice in a magnetic field   We study the superconductor to insulator transition at zero temperature in a
Josephson-junction array model on a honeycomb lattice with $f$ flux quantum per
plaquette. The path integral representation of the model corresponds to a
(2+1)-dimensional classical model, which is used to investigate the critical
behavior by extensive Monte Carlo simulations on large system sizes. In
contrast to the model on a square lattice, the transition is found to be first
order for $f=1/3$ and continuous for $f=1/2$ but in a different universality
class. The correlation-length critical exponent is estimated from finite-size
scaling of vortex correlations. The estimated universal conductivity at the
transition is approximately four times its value for $f=0$. The results are
compared with experimental observations on ultrathin superconducting films with
a triangular lattice of nanoholes in a transverse magnetic field.

1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn