Non-Hermitian topological phenomena: A review

N Okuma, M Sato - Annual Review of Condensed Matter Physics, 2023‏ - annualreviews.org
The past decades have witnessed an explosion of interest in topological materials, and a lot
of mathematical concepts have been introduced in condensed matter physics. Among them …

Experimental perspective on three-dimensional topological semimetals

BQ Lv, T Qian, H Ding - Reviews of Modern Physics, 2021‏ - APS
Topological semimetals (TSMs) are characterized by bulk band crossings in their electronic
structures, which are expected to give rise to gapless electronic excitations and topological …

Photonic flatband resonances for free-electron radiation

Y Yang, C Roques-Carmes, SE Kooi, H Tang, J Beroz… - Nature, 2023‏ - nature.com
Flatbands have become a cornerstone of contemporary condensed-matter physics and
photonics. In electronics, flatbands entail comparable energy bandwidth and Coulomb …

Topological transition from nodal to nodeless Zeeman splitting in altermagnets

RM Fernandes, VS De Carvalho, T Birol, RG Pereira - Physical Review B, 2024‏ - APS
In an altermagnet, the symmetry that relates configurations with flipped magnetic moments is
a rotation. This makes it qualitatively different from a ferromagnet, where no such symmetry …

Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet

I Belopolski, K Manna, DS Sanchez, G Chang, B Ernst… - Science, 2019‏ - science.org
Topological matter is known to exhibit unconventional surface states and anomalous
transport owing to unusual bulk electronic topology. In this study, we use photoemission …

Weyl, Dirac and high-fold chiral fermions in topological quantum matter

MZ Hasan, G Chang, I Belopolski, G Bian… - Nature Reviews …, 2021‏ - nature.com
Quantum materials hosting Weyl fermions have opened a new era of research in condensed
matter physics. First proposed in 1929 in the context of particle physics, Weyl fermions have …

Weyl and Dirac semimetals in three-dimensional solids

NP Armitage, EJ Mele, A Vishwanath - Reviews of Modern Physics, 2018‏ - APS
Weyl and Dirac semimetals are three-dimensional phases of matter with gapless electronic
excitations that are protected by topology and symmetry. As three-dimensional analogs of …

Classification of exceptional points and non-Hermitian topological semimetals

K Kawabata, T Bessho, M Sato - Physical review letters, 2019‏ - APS
Exceptional points are universal level degeneracies induced by non-Hermiticity. Whereas
past decades witnessed their new physics, the unified understanding has yet to be obtained …

Non-Hermitian skin modes induced by on-site dissipations and chiral tunneling effect

Y Yi, Z Yang - Physical Review Letters, 2020‏ - APS
In this Letter, we study the conditions under which on-site dissipations can induce non-
Hermitian skin modes in non-Hermitian systems. When the original Hermitian Hamiltonian …

Classification of topological quantum matter with symmetries

CK Chiu, JCY Teo, AP Schnyder, S Ryu - Reviews of Modern Physics, 2016‏ - APS
Topological materials have become the focus of intense research in recent years, since they
exhibit fundamentally new physical phenomena with potential applications for novel devices …