Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum disorder versus order-out-of-disorder in the Kugel-Khomskii
  model   The Kugel-Khomskii model, the simplest model for orbital degenerate magnetic
insulators, exhibits a zero temperature degeneracy in the classical limit which
could cause genuine quantum disorder. Khaliullin and Oudovenko [Phys. Rev. B
56, R14 243 (1997)] suggested recently that instead a particular classical
state could be stabilized by quantum fluctuations. Here we compare their
approach with standard random phase approximation and show that it strongly
underestimates the strength of the quantum fluctuations, shedding doubts on the
survival of any classical state.

35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex