Better energy harvesting with law-breaking device

https://phys.org/news/2023-07-energy-harvesting-law-breaking-device.html

"Kirchhoff's thermal radiation law, absorptive and emissive efficiencies equal at each wavelength and incidence angle... higher energy conversion efficiencies... device placed in moderate magnetic field... combines strong combined magnetic-field response and patterned structure materials, enhances absorption and emission in IR... heating the device above room-temperature and directly comparing the emissive efficiency to the absorptive efficiency...camouflage"