Kavli Affiliate: Zhuo Li
| First 5 Authors: Yukun Yang, Hao Hu, Liangliang Liu, Yihao Yang, Youxiu Yu
| Summary:
Time photonic crystals are media in which their electromagnetic parameters
are modulated periodically in time, showing promising applications in
non-resonant lasers and particle accelerators, among others. Traditionally
utilized to study space photonic crystals, topological band theory has also
been translated recently to analyze time photonic crystals with time inversion
symmetry, enabling the construction of the temporal version of topological edge
states. However, temporal disorder can readily break time inversion symmetry in
practice, hence likely destroying the edge states associated with this type of
time photonic crystals. To overcome this limitation, here we propose a new
class of time photonic crystals presenting chiral symmetry instead, whose edge
states exhibit superior robustness over the time-reversal-symmetry-protected
counterparts. Our time photonic crystal is equivalent to a temporal version of
the Su-Schrieffer-Heeger model, and the chiral symmetry of this type of time
photonic crystals quantizes the winding number defined in the Bloch frequency
band. Remarkably, random temporal disorders do not impact the eigenfrequencies
of these chiral-symmetry-protected edge states, while instead enhancing their
temporal localizations. Our findings thus provide a promising paradigm to
control field amplification with exceptional robustness as well as being a
feasible platform to investigate various topological phases in time-varying
media.
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