Broad spectral tuning of ultra-low-loss polaritons in a van der Waals crystal by intercalation

Javier Taboada-Gutiérrez, Gonzalo Álvarez-Pérez, Jiahua Duan, Weiliang Ma, Kyle Crowley, Iván Prieto, Andrei Bylinkin, Marta Autore, Halyna Volkova, Kenta Kimura, Tsuyoshi Kimura, M. H. Berger, Shaojuan Li, Qiaoliang Bao, Xuan P.A. Gao, Ion Errea, Alexey Y. Nikitin, Rainer Hillenbrand, Javier Martín-Sánchez^*, Pablo Alonso-González^*