This is actually seriously neat. Continuously responding to ambient heat allows voltage a harvesting on a chip which may well be suffice to drive the device. May also be able to convert that energy into a coherent radiation source which will make for a near loss free system.
Still a ways to get thee but we are surely half way there for recognizing what is happening mechanically.
all Good. It also seriously informs us that the actual graphene surface is not stable at all. Much trickier than that and now potential much more useful as well.