UChicago Finds 100K-Coherent Flat-Band Electrons in Fe₅GeTe₂, Opening Path to New Memory
Updated
Updated · BIOENGINEER.ORG · Aug 10
UChicago Finds 100K-Coherent Flat-Band Electrons in Fe₅GeTe₂, Opening Path to New Memory
2 articles · Updated · BIOENGINEER.ORG · Aug 10
Summary
Fe₅GeTe₂ showed an interaction-driven flat band and charge-ordered quantum state in which electrons move collectively at unusually low effective speeds while staying coherent, according to a Science Advances study.
10-micrometer ARPES measurements revealed the band flattening, indicating strong electron-electron interactions—not ordinary single-particle motion or simple lattice geometry—dominate the material’s behavior.
100 kelvin above absolute zero, the effect still persisted, a relatively high temperature for fragile quantum states and a sign the material could be more practical than many correlated systems.
University of Chicago researchers now aim to test whether lasers can switch Fe₅GeTe₂ between quantum and magnetic phases, potentially creating ultrathin memory elements that store data through collective electronic states.