https://phys.org/news/2018-07-weyl-thermopilelow-power-devices-day-heat-based.html

So what is this anomalous Nernst effect and how could it lead to such a great leap forward?

"The anomalous Nernst effect is when a magnetized piece of metal generates a voltage subject to a gradient of heat across it, so it's hotter on one side and cooler on the other," explains Nakatsuji. This is similar to a more established phenomenon called the Seebeck effect, which is responsible for power generation in thermopiles, the functional components of thermoelectric generators. These are used in deep-space probes like Voyager and New Horizons, amongst other things. With the Seebeck effect, the voltage is generated between the hot and cold regions of the metal in question, so it's parallel to the temperature gradient. The anomalous Nernst effect however generates a voltage along the length of a magnetized piece of metal, perpendicular to the temperature gradient.