47 citations · 192 across the 11 of their papers we have counts for
11 papers
Hawking Radiation in non-Hermitian Microscopic Analogues
Diego F. Munoz-Arboleda, Cristiane Morais Smith, Marcus Stålhammar
Non-Hermitian systems have recently emerged as a convenient platform to realize black-hole physics. Here, we propose a microscopic open quantum system, namely a fermionic tight-bin…
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…
Magneto-optical Hall response in generic Weyl semimetals
Marcus Stålhammar
Weyl semimetals are predicted to host signature magneto-optical properties sourced by their peculiar Landau level structure, including the chiral level. Analytical studies are ofte…
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…
Emergent Chern-Simons Interactions in 3+1 Dimensions
Marcus Stålhammar, Darya Rudneva, Thors Hans Hansson +1
Parity violating superconductors can support a low-dimension local interaction that becomes, upon condensation, a purely spatial Chern-Simons term. Solutions to the resulting gener…
Fractal Nodal Band Structures
Marcus Stålhammar, Cristiane Morais Smith
Non-Hermitian systems exhibit interesting band structures, where novel topological phenomena arise from the existence of exceptional points at which eigenvalues and eigenvectors co…
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…
Classification of Exceptional Nodal Topologies Protected by Symmetry
Marcus Stålhammar, Emil J. Bergholtz
Exceptional degeneracies, at which both eigenvalues and eigenvectors coalesce, and parity-time () symmetry, reflecting balanced gain and loss in photonic systems, are…
On the Electromagnetic Response of Topological Superconductors
Marcus Stålhammar, Michael Stone, Masatoshi Sato +1
We resolve several puzzles related to the electromagnetic response of topological superconductors in 3+1 dimensions. In particular we show by an analytical calculation that the int…
Magneto-optical conductivity in generic Weyl semimetals
Marcus Stålhammar, Jorge Larana-Aragon, Johannes Knolle +1
Magneto-optical studies of Weyl semimetals have been proposed as a versatile tool for observing low-energy Weyl fermions in candidate materials including the chiral Landau level. H…