First heat transistor

A team of physicists at the Low Temperature Laboratory in Helsinki, Finland have built the world's first heat transistor. A working prototype, which uses an electrical signal to control the flow of heat, measures only a few millionths of a meter across.

Despite the name, a heat transistor can also provide cooling. After all, chilling involves ensuring that heat flows away from object rather than toward it. As a result, heat transistors are likely to become important components in tiny refrigerators and heaters, as well as leading to sensitive new devices for measuring temperature and heat flow-American Physical Society

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