Non-hermitian physics

Y Ashida, Z Gong, M Ueda - Advances in Physics, 2020‏ - Taylor & Francis
A review is given on the foundations and applications of non-Hermitian classical and
quantum physics. First, key theorems and central concepts in non-Hermitian linear algebra …

Exceptional topology of non-Hermitian systems

EJ Bergholtz, JC Budich, FK Kunst - Reviews of Modern Physics, 2021‏ - APS
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 are reviewed …

Topological metamaterials

X Ni, S Yves, A Krasnok, A Alu - Chemical Reviews, 2023‏ - ACS Publications
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 …

Non-Hermitian topology in static mechanical metamaterials

A Wang, Z Meng, CQ Chen - Science advances, 2023‏ - science.org
The combination of broken Hermiticity and band topology in physical systems unveils a
novel bound state dubbed as the non-Hermitian skin effect (NHSE). Active control that …

3D metamaterials

M Kadic, GW Milton, M van Hecke… - Nature reviews physics, 2019‏ - nature.com
Metamaterials are rationally designed composites aiming at effective material parameters
that go beyond those of the ingredient materials. For example, negative metamaterial …

Observation of non-Hermitian topology and its bulk–edge correspondence in an active mechanical metamaterial

A Ghatak, M Brandenbourger, J Van Wezel… - Proceedings of the …, 2020‏ - pnas.org
Topological edge modes are excitations that are localized at the materials' edges and yet
are characterized by a topological invariant defined in the bulk. Such bulk–edge …

Observation of higher-order topological acoustic states protected by generalized chiral symmetry

X Ni, M Weiner, A Alu, AB Khanikaev - Nature materials, 2019‏ - nature.com
Topological systems are inherently robust to disorder and continuous perturbations,
resulting in dissipation-free edge transport of electrons in quantum solids, or reflectionless …

Tailoring structure‐borne sound through bandgap engineering in phononic crystals and metamaterials: a comprehensive review

M Oudich, NJRK Gerard, Y Deng… - Advanced Functional …, 2023‏ - Wiley Online Library
In solid state physics, a bandgap (BG) refers to a range of energies where no electronic
states can exist. This concept was extended to classical waves, spawning the entire fields of …

Flexible mechanical metamaterials

K Bertoldi, V Vitelli, J Christensen… - Nature Reviews …, 2017‏ - nature.com
Mechanical metamaterials exhibit properties and functionalities that cannot be realized in
conventional materials. Originally, the field focused on achieving unusual (zero or negative) …

Topological phonons and thermoelectric conversion in crystalline materials

ZK Ding, YJ Zeng, W Liu, LM Tang… - Advanced Functional …, 2024‏ - Wiley Online Library
Topological phononics, a fascinating frontier in condensed matter physics, holds great
promise for advancing energy‐related applications. Topologically nontrivial phonons …