8 papers
Generation and manipulation of multipole and vortex events in (1+1)-dimensional spacetime
Yiming Pan, Guowei Chen
An event is usually regarded as a zero-dimensional coordinate label in spacetime, rather than as an object with spatial extent, internal structure or topology. Here we show that in…
Time domain Stokes mechanism of pair correlated k gap solitons in nonlinear photonic time crystal slabs
Jiaxiang Sun, Guowei Chen, Liang Zhang +1
Pair generation in time-varying media is commonly attributed to time reflection at temporal boundaries or to amplification inside momentum k gaps. Here we show that these two proce…
Breathing k-Gap Events and Instability on Instability in Nonlinear Photonic Time Crystals
Liang Zhang, Chenhao Pan, Yiming Pan
Photonic time crystals (PTCs) host momentum bandgaps, or k gaps, that enable parametric amplification and lasing of seeded fields. In nonlinear PTCs, Kerr saturation dynamically su…
Quantization and Biphoton Statistics of k-Gap Solitons in Nonlinear Photonic Time Crystals
Liang Zhang, Chenhao Pan, Yiming Pan
Nonlinear photonic time crystals (PTCs) can support solitons inside momentum k gaps, where the amplification of k gap modes is saturated by Kerr nonlinearity, forming spatially hom…
Data-driven reconstruction of band dispersion and quantum geometry via Koopman dynamical mode decomposition
Yiming Pan, Jinze He, Jiapeng Yang +1
We present a data-driven framework for reconstructing band structures using Koopman operator analysis and dynamic mode decomposition (Koopman-DMD). Instead of deriving spectra from…
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…