Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directed current in quasi-adiabatically ac-driven nonlinear systems   We rigorously prove the existence of directed transport for a certain class
of ac-driven nonlinear one dimensional systems, namely the generation of
transport with a preferred direction in the absence of a net driving force.

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The categories of this paper are: eess
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The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex