Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ratchet effect in an underdamped periodic potential and its
  characterisation   Ratchet effect in a driven underdamped periodic potential system is studied.
The presence of a space dependent and periodic friction coefficient, but with a
phase difference with the symmetric periodic potential is shown to generate
substantial ratchet current.The ratchet performance is characterised in terms
of the various parameters of transport. The performance of this ratchet is
compared with a ratchet with an underlying periodic and asymmetric potential.
It is shown that an optimum combination of inhomogeneity in the system and
asymmetry of the potential can substantially enhance the performance of an
underdamped ratchet.

2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn