Milliwatt terahertz harmonic generation from topological insulator metamaterials

Klaas-Jan Tielrooij (Corresponding author), Alessandro Principi, David Saleta Reig, Alexander Block, Sebin Varghese, Steffen Schreyeck, Karl Brunner, Grzegorz Karczewski, Igor Ilyakov, Oleksiy Ponomaryov, Thales V.A.G. de Oliveira, Min Chen, Jan-Christoph Deinert, Carmen Gomez Carbonell, Sergio O. Valenzuela, Laurens W. Molenkamp, Tobias Kiessling, Georgy V. Astakhov (Corresponding author), Sergey Kovalev (Corresponding author)