Heat moves as both particles and waves in this material.
The material shows a high thermoelectric performance (zT of 1.7).
Potential uses include power plants, cars, and data centers.
The study was published in the journal Science Advances.
This wave‑like movement could let factories turn waste heat into electricity.
The crystal, called thallium copper selenide, has copper atoms that wiggle in a confined way.
Using computer models, scientists explained how these vibrations create the new heat‑transport effect.
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