Initially proposed to achieve strong noise isolation levels beyond the mass-density law,
acoustic metamaterials (AMMs) have now overturned the conventional views in all aspects …

The past few years have witnessed a surge of interest in non-Hermitian Floquet topological
matter due to its exotic properties resulting from the interplay between driving fields and non …

Abstract Space− time modulated metamaterials support extraordinary rich applications, such
as parametric amplification, frequency conversion, and non-reciprocal transmission. The …

We explore the unconventional wave scattering properties of non-Hermitian systems in
which amplification or damping are induced by time-periodic modulation. These non …

Standard exceptional points (EPs) are non-Hermitian degeneracies that occur in open
systems. At an EP, the Taylor series expansion becomes singular and fails to converge—a …

Parity-time (PT) symmetry has recently been opening exciting directions in photonics, yet the
required careful balance of loss and gain has been hindering its widespread applicability …

Chu's limit determines the minimum radiation quality factor Q of an electrically small
resonator, and hence its maximum operational bandwidth, which is inversely proportional to …

The cooperation between time-periodic driving fields and non-Hermitian effects could
endow systems with distinctive spectral and transport properties. In this paper, we uncover …

In closed quantum systems, dynamical phase transitions are identified by the nonanalytic
behavior of the return probability as a function of time. In this work, we study the nonunitary …

The exploration of quantum‐inspired symmetries in optical and photonic systems has
witnessed immense research interest both fundamentally and technologically in a wide …