Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 3D quantum percolation studied by level statistics   We study the metal-insulator transition on a three dimensional quantum
percolation model by analyzing energy level statistics. The quantum percolation
threshold $\pq$, which is larger than the classical percolation threshold
$\pc$, becomes smaller when the time reversal symmetry (TRS) is broken, i.e.
$\pq({\rm with TRS})>\pq({\rm without TRS})>\pc$. It is shown that critical
exponents are consistent with the result of the Anderson transition, suggesting
that the quantum percolation problem can be classified into the same
universality classes of the Anderson transition. The shape of level statistics
at the critical point is also reported.

11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga