41 citations · 109 across the 6 of their papers we have counts for
6 papers
Abelian Spectral Topology of Multifold Exceptional Points
Marcus Stålhammar, Lukas Rødland
The advent of non-Hermitian physics has enriched the plethora of topological phases to include phenomena without Hermitian counterparts. Despite being among the most well-studied u…
Winding Topology of Multifold Exceptional Points
Tsuneya Yoshida, J. Lukas K. König, Lukas Rødland +2
Despite their ubiquity, a systematic classification of multifold exceptional points, -fold spectral degeneracies (EPs), remains a significant unsolved problem. In this articl…
Homotopy, Symmetry, and Non-Hermitian Band Topology
Kang Yang, Zhi Li, J. Lukas K. König +3
Non-Hermitian matrices are ubiquitous in the description of nature ranging from classical dissipative systems, including optical, electrical, and mechanical metamaterials, to scatt…
Symmetry-protected exceptional and nodal points in non-Hermitian systems
Sharareh Sayyad, Marcus Stalhammar, Lukas Rodland +1
One of the unique features of non-Hermitian~(NH) systems is the appearance of non-Hermitian degeneracies known as exceptional points~(EPs). The extensively studied defective EPs oc…
symmetry-protected exceptional cones and analogue Hawking radiation
Marcus Stålhammar, Jorge Larana-Aragon, Lukas Rødland +1
Non-Hermitian Hamiltonians, which effectively describe dissipative systems, and analogue gravity models, which simulate properties of gravitational objects, comprise seemingly diff…
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…