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Summary: NATURE PHYSICS | VOL 7 | FEBRUARY 2011 | www.nature.com/naturephysics 101
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be continuously changed to follow this.
Moreover, the phase of the driver must also
be varied to maintain its synchronization
with the oscillator. is suggests that
to achieve optimal energy transfer, the
state of the oscillator must be constantly
monitored so that it can be fed back to
control the driver. Yet it turns out that this
isn't necessary. By chirping the driving
frequency -- that is, rapidly changing
its frequency at a constant rate -- above
a certain threshold driving amplitude,
the frequency and phase of the oscillator
can be autoresonantly forced to follow
the excitation, rather than the other
way around. Below the threshold, the
oscillator goes its own way, but above the
threshold it becomes locked in with the
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