Enabling heat to flow preferentially in one direction could lead to cooler, safer and more reliable electronics. A one-way ticket for thermal radiative heat transfer, based on thermal rectification technology, has been devised by University of Houston engineers.
The process described in Physical Review Research provides a means to effectively control radiative heat with the same precision that electronic diodes control electrical currents. This can translate into longer-lasting batteries for consumer electronics, electric vehicles and satellites, and offer a cooling solution for artificial intelligence data centers.
Semiconductor material is placed under a magnetic field to form nonreciprocal emitters, which changes how energy moves at the microscopic level and allows heat flow to be directed with more control than previously possible. Such control of radiative heat can be augmented by a circulator, which moves radiative heat in a continuous loop.
A complementary study published in Physical Review B demonstrates that similar principles can induce asymmetric thermal conductivity in materials and enable conduction heat rectification. This finding bridges the gap to everyday electronics, offering a potential solution for the conductive heat generated by high-performance microchips and batteries.
The technology could be particularly valuable for space systems, where satellite electronics must remain cool despite constant exposure to sunlight. It will allow internal heat to escape while blocking solar heat from entering, thus improving reliability and reducing the risk of overheating.
