Symmetry is one of the cornerstones of modern physics and has profound implications in
different areas. In symmetry-protected topological systems, symmetries are responsible for …

Berry phases have long been known to significantly alter the properties of periodic systems,
resulting in anomalous terms in the semiclassical equations of motion describing wave …

In recent years, non-Hermitian phases in classical and quantum systems have garnered
significant attention. In particular, their intriguing band geometry offers a platform for …

We show that lasing in flat-band lattices can be stabilized by means of the geometrical
properties of the Bloch states, in settings where the single-particle dispersion is flat in both …

Topological waveguide arrays, which support robust light propagation through edge modes,
offer a promising solution for fault-tolerant photonic chips. However, these arrays commonly …

A unique feature of non-Hermitian systems is the extreme sensitivity of the eigenspectrum to
boundary conditions with the emergence of the non-Hermitian skin effect (NHSE). A NHSE …

The anomalous bulk-boundary correspondence in non-Hermitian systems featuring an
intricate interplay between skin and boundary modes has attracted enormous theoretical …

Topological phase transitions in band models are usually associated to the gap closing
between the highest valance band and the lowest conduction band, which can give rise to …

Non-reciprocal lattice systems are among the simplest non-Hermitian systems, exhibiting
several key features absent in their Hermitian counterparts. In this study, we investigate the …