title: Nonsinusoidal current and current reversals in a gating ratchet.
abstract: In this work, the ratchet dynamics of Brownian particles driven by an external sinusoidal (harmonic) force is investigated. The gating ratchet effect is observed when another harmonic is used to modulate the spatially symmetric potential in which the particles move. For small amplitudes of the harmonics, it is shown that the current (average velocity) of particles exhibits a sinusoidal shape as a function of a precise combination of the phases of both harmonics. By increasing the amplitudes of the harmonics beyond the small-limit regime, departures from the sinusoidal behavior are observed and current reversals can also be induced. These current reversals persist even for the overdamped dynamics of the particles.
authors: Departamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de Madrid, 28040 Madrid, Spain.|GISC-Grupo Interdisciplinar de Sistemas Complejos, Madrid, Spain.
authors: Luis
authors: L
authors: Dinis
authors: Instituto de Matemáticas de la Universidad de Sevilla (IMUS).|Departamento de Física Aplicada I, E.P.S., Universidad de Sevilla, Calle Virgen de África 7, 41011 Sevilla, Spain.
authors: Niurka R
authors: NR
authors: Quintero