  We study the control of transport properties in a deterministic inertia
ratchet system via the extended delay feedback method. A chaotic current of a
deterministic inertia ratchet system is controlled to a regular current by
stabilizing unstable periodic orbits embedded in a chaotic attractor of the
unperturbed system. By selecting an unstable periodic orbit, which has a
desired transport property, and stabilizing it via the extended delay feedback
method, we can control transport properties of the deterministic inertia
ratchet system. Also, we show that the extended delay feedback method can be
utilized for separation of particles in the deterministic inertia ratchet
system as a particle's initial condition varies.
