title: Transport by bi-harmonic drives: from harmonic to vibrational mixing.
abstract: Transport in a one-dimensional symmetric device can be activated by the combination of thermal noise and a bi-harmonic drive. The results of extensive simulations allow us to distinguish between two apparently different bi-harmonic regimes: (i) harmonic mixing, where the two drive frequencies are commensurate but not too high; (ii) vibrational mixing, where one harmonic drive component possesses a high frequency but finite amplitude-to-frequency ratio. A comparison with the earlier theoretical predictions shows that at present the analytical understanding of nonlinear frequency mixing is still not satisfactory.
authors.affiliation: Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy. Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Borromeo
authors.forename: P
authors.initials: P
authors.lastname: Hänggi
authors.forename: F
authors.initials: F
authors.lastname: Marchesoni