Evidence that atomically thin hafnium telluride is an excitonic insulator

https://phys.org/news/2024-02-evidence-atomically-thin-hafnium-telluride.html 

"excitons condensation with non-zero momentum enables charge density waves prompting transition into quantum excitonic insulator... small amount n-type doping increased transition temperature... valence band top formed a flat band at low temperatures, opening a gap near the Fermi surface... metal-insulator transition when thickness <3 layers... electric gating or strain stimuli controls carrier concentration or band structure and thus order parameter of electron-hole coherence... high-temperature superconductivity, superfluidity"

Related:

Scientists discover exotic quantum interference effect in a topological insulator device
https://phys.org/news/2024-02-scientists-exotic-quantum-effect-topological.html

Novel fabrication technique takes transition metal telluride nanosheets from lab to mass production
https://phys.org/news/2024-04-fabrication-technique-transition-metal-telluride.html