  Synchronization is a ubiquitous phenomenon in nature and we propose its new
perspective in ultrafast dynamics in interacting electron systems. In
particular, using graphene irradiated by an intense bi-circular pulse laser as
a prototypical and experimental viable example, we theoretically investigate
how to selectively generate a coherent oscillation of electronic order such as
charge density waves (CDW). The key is to use tailored fields that match the
crystalline symmetry broken by the target order. After the pump, a macroscopic
number of electrons start oscillating and coherence is built up through a
transition. The resulting physics is detectable as a coherent light emission at
the synchronization frequency and may be used as a purely electronic way of
realizing Floquet states respecting exotic space time crystalline symmetries.
In the process, we also explore possible flipping of existing static CDW orders
and generation of higher harmonics. The general framework for the coherent
electronic order is found to be analogous with the celebrated Kuramoto model,
describing the classical synchronization of coupled pendulums.
