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.…
Space-time crystals from particle-like topological solitons
Chaikin, P. M. & Lubensky, T. C. Principles of Condensed Matter Physics (Cambridge Univ. Press, 2000). Yeh, P.…