11 papers
Phase Transitions and Generalized Biorthogonal Polarization in Non-Hermitian Systems
Elisabet Edvardsson, Flore K. Kunst, Tsuneya Yoshida +1
Non-Hermitian (NH) Hamiltonians can be used to describe dissipative systems, and are currently intensively studied in the context of topology. A salient difference between Hermitia…
Dissipative analog of four-dimensional quantum Hall physics
Fanny Terrier, Flore K. Kunst
Four-dimensional quantum Hall (QH) models usually rely on synthetic dimensions for their simulation in experiment. Here, we study a QH system which features a nontrivial configurat…
Exceptional Topology of Non-Hermitian Systems
Emil J. Bergholtz, Jan Carl Budich, Flore K. Kunst
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 reviewe…
Corner states of light in photonic waveguides
Ashraf El Hassan, Flore K. Kunst, Alexander Moritz +3
The recently established paradigm of higher-order topological states of matter has shown that not only, as previously thought, edge and surface states but also states localised to…
Non-Hermitian extensions of higher-order topological phases and their biorthogonal bulk-boundary correspondence
Elisabet Edvardsson, Flore K. Kunst, Emil J. Bergholtz
Non-Hermitian Hamiltonians, which describe a wide range of dissipative systems, and higher-order topological phases, which exhibit novel boundary states on corners and hinges, comp…
Extended Bloch theorem for topological lattice models with open boundaries
Flore K. Kunst, Guido van Miert, Emil J. Bergholtz
While the Bloch spectrum of translationally invariant noninteracting lattice models is trivially obtained by a Fourier transformation, diagonalizing the same problem in the presenc…