  We consider thermal ratchets modeled by overdamped Brownian motion in a
spatially periodic potential with a tilting process, both unbiased on average.
We investigate the impact of the introduction of roughness in the potential
profile, over the flux and efficiency of the ratchet. Both amplitude and
wavelength that characterize roughness are varied. We show that depending on
the ratchet parameters, rugosity can either spoil or enhance the ratchet
performance.
