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physics.optics2025
Topologically-protected superluminal pair annihilation in photonic time crystals
Liang Zhang, Chenhao Pan, Jinze He +4
Photonic time crystals (PTCs) - dielectric media whose permittivity is periodically modulated in time - map to a Dirac equation with an imaginary mass, opening a momentum gap (k-ga…
physics.optics2025
Amplifying solid-state high harmonic generations with momentum k-gaps in band structure engineering
Yiming Pan, Danni Chen, Xiaoxi Xu +2
We propose a novel amplification mechanism for high harmonic generation (HHG) in solids by leveraging bandgap engineering with momentum k-gaps. By constructing a simple diatomic la…
physics.optics2025
Event Soliton Formation in Mixed Energy-Momentum Gaps of Nonlinear Spacetime Crystals
Liang Zhang, Zhiwei Fan, Yiming Pan
We report the formation of a novel soliton, termed event soliton, in nonlinear photonic spacetime crystals (STCs). In these media, simultaneous spatiotemporal periodic modulation o…