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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…
Particle-Hole Duality, Emergent Fermi Liquids and Fractional Chern Insulators in Moiré Flatbands
Ahmed Abouelkomsan, Zhao Liu, Emil J. Bergholtz
Moiré flatbands, occurring, e.g., in twisted bilayer graphene at magic angles, have attracted ample interest due to their high degree of experimental tunability and the intriguing…
Hyperbolic Nodal Band Structures and Knot Invariants
Marcus Stålhammar, Lukas Rødland, Gregory Arone +2
We extend the list of known band structure topologies to include a large family of hyperbolic nodal links and knots, occurring both in conventional Hermitian systems where their st…
Non-Hermitian Weyl Physics in Topological Insulator Ferromagnet Junctions
Emil J. Bergholtz, Jan Carl Budich
We introduce and investigate material junctions as a generic and tuneable electronic platform for the realization of exotic non-Hermitian (NH) topological states of matter, where t…
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…
Fractional quantum Hall states with gapped boundaries in an extreme lattice limit
Zhao Liu, Emil J. Bergholtz
We present a detailed microscopic investigation of fractional quantum Hall states with gapped boundaries in a coupled bilayer lattice model featuring holes whose counterpropagating…