Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From ballistic motion to localization: a phase space analysis   We introduce phase space concepts to describe quantum states in a disordered
system. The merits of an inverse participation ratio defined on the basis of
the Husimi function are demonstrated by a numerical study of the Anderson model
in one, two, and three dimensions. Contrary to the inverse participation ratios
in real and momentum space, the corresponding phase space quantity allows for a
distinction between the ballistic, diffusive, and localized regimes on a unique
footing and provides valuable insight into the structure of the eigenstates.

7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga