We review the current understanding of the role of topology in non-Hermitian (NH) systems, and its far-reaching physical consequences observable in a range of dissipative settings. In particular, we elucidate how the paramount and genuinely NH concept of exceptional degeneracies, at which both eige...
In this case, the tiny non-adiabatic coupling between the loss and gain modes of the non-Hermitian system induces non-adiabatic transitions, which breaks the adiabaticity. It results in the transition from the blue Riemann surface to the red one during the evolution, eventually return to itself...
K. Exceptional topology of non-Hermitian systems. Rev. Mod. Phys. 93, 15005 (2021). ADS MathSciNet Google Scholar Ashida, Y., Gong, Z. & Ueda, M. Non-Hermitian physics. Adv. Phys. 69, 3 (2020). Google Scholar El-Ganainy, R. et al. Non-Hermitian physics and PT symmetry. ...
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. In this Review, we highlight the latest fundamental advances in the c
We further demonstrate that ECs can be observed in prototypical non-Hermitian photonic crystals. Our results combine the effect of non-Hermitian spatiotemporal symmetry and topology to pave the way for understanding and manipulating the morphology of ELs in non-Hermitian crystalline systems.#Exceptional...
Different parameters naturally have different landscapes and amplitude; topology But there will still be chiral state transfer. Generally speaking is related to track asymmetry and non Hermiticity: the more symmetrical and Hermitian, the more symmetrical the state will be; the more asymmetric, the non...
We propose a novel way of modulating exceptional topology by implementing Floquet engineering in non-Hermitian (NH) systems. We introduce Floquet exceptional topological insulator which results from shining circularly polarized light on a three-dimensional NH topological insulator i.e. NH generalization ...
Exploiting the complex-square-root topology near such non-Hermitian degener... Wiersig,Jan - 《Physical Review A》 被引量: 39发表: 2016年 Exceptional Points and Asymmetric Mode Switching in Plasmonic Waveguides We investigate the exceptional points (EPs) in a non-Hermitian system composed of a...
The ideas of topology have found tremendous success in closed physical systems, but even richer properties exist in the more general open or dissipative framework. We theoretically propose and experimentally demonstrate a bulk Fermi arc that develops from non-Hermitian radiative losses in an open syste...
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 interactions with the external environment. The non-Hermitian fr