Dynamic control of thermal transport in solid-state systems is a transformative capability
with the promise to propel technologies including phononic logic, thermal management,
and energy harvesting. A solid-state solution to rapidly manipulate phonons has escaped
the scientific community. We demonstrate active and reversible tuning of thermal conductivity
by manipulating the nanoscale ferroelastic domain structure of a Pb(Zr0.3Ti0.7)O3
film with applied electric fields. With subsecond response times, the room-temperature
thermal conductivity was modulated by 11%.