Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital Order, Metal Insulator Transition, and Magnetoresistance-Effect
  in the two-orbital Hubbard model   We study the effects of temperature and magnetic field on a two-orbital
Hubbard model within dynamical mean field theory. We focus on the quarter
filled system, which is a special point in the phase diagram due to orbital
degeneracy. At this particular filling the model exhibits two different
long-range order mechanisms, namely orbital order and ferromagnetism. Both can
cooperate but do not rely on each other's presence, creating a rich phase
diagram. Particularly, in the vicinity of the phase transition to an orbitally
ordered ferromagnetic state, we observe a strong magnetoresistance effect.
Besides the low temperature phase transitions, we also observe a crossover
between a paramagnetic insulating and a paramagnetic metallic state for
increasing Hund's coupling at high temperatures.

26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci