The exploration of quantum‐inspired symmetries in optical and photonic systems has
witnessed immense research interest both fundamentally and technologically in a wide …

Nonlinear responses are actively studied as probes of topology and band geometric
properties of solids. Here, we show that second harmonic generation serves as a probe of …

Nonlinear optical response is well studied in the context of semiconductors and has gained
a renaissance in studies of topological materials in the recent decade. So far it mainly deals …

Within the expanding field of non-Hermitian physics, non-Hermitian pum** has emerged
as a key phenomenon, epitomized through the skin effect via extensive boundary mode …

This work unveils how geometric features of two-band non-Hermitian Hamiltonians can
classify the topology of their eigenstates and energy manifolds. Our approach generalizes …

The geometric properties of quantum states are fully encoded by the quantum geometric
tensor. The real and imaginary parts of the quantum geometric tensor are the quantum …

The importance of the quantum metric in flat-band systems has been noticed recently in
many contexts such as the superfluid stiffness, the dc electrical conductivity, and ideal Chern …

The spectral properties of a non‐Hermitian quasi‐1D lattice in two of the possible
dimerization configurations are investigated. Specifically, it focuses on a non‐Hermitian …

The fidelity susceptibility is a tool for studying quantum phase transitions in the Hermitian
condensed matter systems. Recently, it has been generalized with the biorthogonal basis for …

In many classical and quantum systems described by an effective non-Hermitian
Hamiltonian, spectral phase transitions, from an entirely real-energy spectrum to a complex …