Multimode phonon-polaritons in lead-halide perovskites in the ultrastrong coupling regime
We fabricated an array of nanoslots (w = 950 nm) on quartz substrates with seven different lengths (l = 30, 40,…
Ultraconfined terahertz phonon polaritons in hafnium dichalcogenides
Li, N. et al. Direct observation of highly confined phonon polaritons in suspended monolayer hexagonal boron nitride. Nat.…