Generating large complete momentum gaps in temporally modulated dispersive media

• DOI: 10.1063/5.0249939
• Publication Date: 2025-06-03T12:50:01Z
• Authors: Yao-Ting Wang; Yu-Huei Chen
• Keywords: Momentum (technical analysis)

This study investigates the generation of a large complete momentum gap (k-gap) in Lorentzian media with plasma frequency varying periodically time. By using energy expression for Lorentz model, Maxwell's equations are reformulated as time-dependent Hamiltonian, allowing an analytical solution Floquet band structure. Our simulations reveal k-gap whose width remains nearly unchanged resonance ω0 increases. Numerical analyses further indicate that emerges when modulation Ω approaches magnitude unmodulated ωp0. k-gap, contrast to those previous studies on systems, suggests potential applications developments non-Hermitian physics or gain mechanisms.