Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground-state phase diagram of the quantum J1-J2 model on the honeycomb
  lattice   We study the ground-state phase diagram of the quantum $J_1-J_2$ model on the
honeycomb lattice by means of an entangled-plaquette variational ansatz. Values
of energy and relevant order parameters are computed in the range $0\le
{J_2}/{J_1} \le 1$. The system displays classical order for
${J_2}/{J_1}\lesssim 0.2$ (N\'eel), and for $J_2/J_1 \gtrsim 0.4$ (collinear).
In the intermediate region, the ground-state is disordered. Our results show
that the reduction of the half-filled Hubbard model to the model studied here
does not yield accurate predictions.

25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con