Topological order restored stabilizing magnetic fields in insulator MnBi2Te4, enabling low-energy topological electronics

https://phys.org/news/2024-09-magnetic-disorder-energy-topological-electronics.html

"intrinsic magnetic topological insulator MnBi2Te4 non-trivial topology/ intrinsic magnetism, more robust quantum anomalous Hall effect at higher temperatures (up to 25°K)... gapless edge state directly coupled to extended percolating bulk metallic regions arising from band gap fluctuations caused by magnetic surface disorder... hybridizes with bulk's extended gapless regions... band gap fluctuations greatly reduced applying a magnetic field, increasing the average exchange gap to 44 meV, close to predicted values"