Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ferrimagnetic and antiferromagnetic phase in bilayer graphene nanoflake
  controlled with external electric fields   The paper presents a computational study of the ground-state magnetic phases
of a selected bilayer graphene nanoflake in external electric field and
magnetic field. The electric field has parallel and perpendicular component
while the magnetic field is oriented in plane. The system consists of two
rectangular layers having armchair edges and zigzag terminations with Bernal
stacking. The theoretical model is based on a tight binding Hamiltonian with
Hubbard term. The magnetic phase diagram involving the total spin is
constructed, showing the stability areas of phases with total spin values equal
to 0 and 1. A significant stability range of antiferromagnetic, layer-like
arrangements is found and extensively discussed. The possibility of switching
between nonmagnetic, antiferromagnetic and ferrimagnetic phases with both
components of external electric field is demonstrated, being a manifestation of
a magnetoelectric effect. The influence of magnetic field on the phase diagrams
is analysed.

12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an