Ultrathin kagome metal hosts robust 3D flat electronic band state

Researchers at Monash University discovered a robust 3D flat electronic band in ultrathin kagome metal films (Mn₃Sn) just three nanometers thick. This achievement, previously thought nearly impossible, combines precision thin-film growth with quantum confinement effects to lock electrons in place across all three dimensions. The breakthrough offers a scalable pathway for engineering exotic quantum states without complex artificial structures, potentially enabling future low-energy electronic technologies and unconventional superconductivity applications.