The law of reciprocity in acoustics and elastodynamics codifies a relation of symmetry
between action and reaction in fluids and solids. In its simplest form, it states that the …

Recent progress on nonlinear properties of parity-time (PT)-symmetric systems is
comprehensively reviewed in this article. PT symmetry started out in non-Hermitian quantum …

One of the challenges of the modern photonics is to develop all‐optical devices enabling
increased speed and energy efficiency for transmitting and processing information on an …

We propose an incident direction independent wave propagation generated by properly
assembling different unidirectional destructive interferences (UDIs), which is a consequence …

Phonons, the quanta of mechanical vibration, are important to the transport of heat and
sound in solid materials. Recent advances in the fundamental control of phonons …

Non-Hermitian Hamiltonians arising from parity-time (PT)-symmetric potentials have been
extensively explored in optical systems, owing to their ability to generate asymmetric and …

We introduce one-and two-dimensional (1D and 2D) models of parity-time (PT)-symmetric
couplers with the mutually balanced linear gain and loss applied to the two cores and cubic …

Symmetry underpins our understanding of physical law. Open systems, those in contact with
their environment, can provide a platform to explore parity-time symmetry. While classical …

In quantum mechanics, with the groundbreaking discovery of parity-time symmetry (PT-
symmetry), Bender and Boettcher unfold the nature of the non-Hermitian Hamiltonian to …

In the actively coupled (AC) pair of waveguides, the growth of small perturbations is
saturated by the focusing nonlinearity that couples the linearly growing mode to the linearly …