Making a 'sandwich' out of magnets and topological insulators shows potential for lossless electronics

https://techxplore.com/news/2022-04-sandwich-magnets-topological-insulators-potential.html

"probe size of bandgap opening... confirm magnetic in origin... angle-resolved photoemission we could also probe the hexagonal warping in the surface state... strength of the warping in the Dirac fermions in our heterostructure is almost twice as large as in Bi2Te3... electronic structure, gap size and temperature at which MnBi2Te4/Bi2Te3/MnBi2Te4 heterostructure is likely to support the QHE effect by combining experimental ARPES observations with magnetic measurements to determine Curie temperature"

Related: Ultrafast laser pulses reveal solid-state bandgaps in motion

https://phys.org/news/2025-10-ultrafast-laser-pulses-reveal-solid.html