Higher-order topology realizes topologically robust corner modes as a manifestation of
nontriviality. We theoretically propose non-Hermitian skin effects which stem from the …

In this paper, we derive a general formula for the quantized fractional corner charge in two-
dimensional C n-symmetric higher-order topological insulators. We assume that the …

Non-Hermitian skin effects and exceptional points are topological phenomena characterized
by integer winding numbers. In this study, we give methods to theoretically detect skin effects …

We demonstrate that the presence of a localized state at the corner of an insulating domain
is not always a predictor nor a direct consequence of a certain nontrivial higher-order …

When interacting spins in condensed matter order ferromagnetically, their ground-state
wave function is topologically trivial. Nonetheless, in two dimensions, ferromagnets can …

Axion insulators are 3D magnetic topological insulators supporting hinge states and
quantized magnetoelectric effects, recently proposed for detecting dark-matter axionic …

We propose an unconventional bulk-edge correspondence for two-dimensional Stiefel-
Whitney insulators and Euler insulators, which are topological insulators protected by the PT …

In recent theoretical and experimental investigations, researchers have linked the low-
energy field theory of a Weyl semimetal gapped with a charge-density wave (CDW) to high …

The field of topological photonics has been on the rise due to its versatility in manufacturing
and its applications as topological lasers or unidirectional waveguides. Contrary to 1D or 2D …

The chiral hinge modes are the key feature of a second-order topological insulator in three
dimensions. Here we propose a quadrupole index in combination of a slab Chern number in …