Exceptional points (EPs) arising in non-Hermitian systems have led to a variety of intriguing
wave phenomena, and have been attracting increased interest in various physical platforms …

Non-Hermitian theory is a theoretical framework used to describe open systems. It offers a
powerful tool in the characterization of both the intrinsic degrees of freedom of a system and …

The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

Exceptional points are spectral singularities in open quantum and wave systems that exhibit
a strong spectral response to perturbations. This feature can be exploited for a new …

Exceptional points (EP) are non-Hermitian degeneracies where eigenvalues and their
corresponding eigenvectors coalesce,,–. Recently, EPs have attracted attention as a means …

Non-Hermitian systems, with symmetric or antisymmetric Hamiltonians under the parity-time
(PT) operations, can have entirely real or imaginary eigenvalues. This fact has led to …

Any system of coupled oscillators may be characterized by its spectrum of resonance
frequencies (or eigenfrequencies), which can be tuned by varying the system's parameters …

By engineering an anti-parity-time (anti-PT) symmetric cavity magnonics system with precise
eigenspace controllability, we observe two different singularities in the same system. One …

Quantum technology has made tremendous strides over the past two decades with
remarkable advances in materials engineering, circuit design, and dynamic operation. In …

Dissipation in mechanics, optics, acoustics, and electronic circuits is nowadays recognized
to be not always detrimental but can be exploited to achieve non-Hermitian topological …