Quantum materials brake THz High-Order Harmonic Generation symmetry barrier, for high-speed communications, imaging, quantum computing

https://www.sciencedaily.com/releases/2025/11/251102011155.htm

"generating both even/ odd THz... highly symmetrical materials like graphene only produce odd harmonics, difficult achieving even harmonics needed for practical applications, overcome utilizing topological insulator thin layers of Bi2Se₃ and van der Waals heterostructures made from (InₓBi₁₋ₓ)2Se₃, with split ring resonators amplifying incoming light... frequency up-conversion at even 6.4 and odd 9.7 THz... compact, tunable THz light sources powered by optics: ultrafast optoelectronic components/ sensors"