Topological excitonic insulator symmetry breaking–induced phase in Ta₂Pd₃Te₅, with a tunable momentum order

https://phys.org/news/2025-07-uncover-topological-excitonic-insulator-tunable.html

"opological materials insulators, yet conductors at their boundary... topological phases influenced by symmetries, electronic energy band structure, interactions, but very few by spontaneous symmetry breaking... insulating energy gap forms at <100°K resulting from 0- momentum excitonic condensation breaking mirror symmetries, > 5°K additional finite-momentum excitonic condensate... finite-momentum condensate's wavevector tunable applying magnetic field... quantum technologies, spintronics, excitonics"