  Electrons in a lattice exhibit time-periodic motion, known as Bloch
oscillation, when subject to an additional static electric field. Here we show
that a corresponding dynamics can occur upon replacing the spatially periodic
potential by a time-periodic driving: Floquet oscillations of charge carriers
in a spatially homogeneous system. The time lattice of the driving gives rise
to Floquet bands that take on the role of the usual Bloch bands. For two
different drivings (harmonic driving and periodic kicking through pulses) of
systems with linear dispersion we demonstrate the existence of such
oscillations, both by directly propagating wave packets and based on a
complementary Floquet analysis. The Floquet oscillations feature richer
oscillation patterns than their Bloch counterpart and enable the imaging of
Floquet bands. Moreover, their period can be directly tuned through the driving
frequency. Such oscillations should be experimentally observable in effective
Dirac systems, such as graphene, when illuminated with circularly polarized
light.
