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physics.optics2026
Thouless Pumping of Wave Action in Photonic Time Crystals
Minwook Kyung, Younsung Kim, Kyungmin Lee +3
A topological pump transports a conserved quantity. Yet temporal modulation exchanges energy with the field, so the transported quantity must be identified from Maxwell's equations…
physics.optics2026
Self-organized photonic time quasicrystal from a single imposed clock
Minwook Kyung, Kyungmin Lee, Yung Kim +3
A photonic time crystal usually writes a clock into a medium. Here one clock does more than program the medium: it seeds a quasiperiodic temporal order that the nonlinear medium se…
physics.optics2025
Analogs of spontaneous emission and lasing in photonic time crystals
Kyungmin Lee, Minwook Kyung, Yung Kim +7
We report the first direct mapping of the frequency-resolved local density of states (LDOS) in a photonic time crystal (PTC) implemented as an array of time-periodically modulated…