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Fermion doubling theorems in 2D non-Hermitian systems for Fermi points and exceptional points
Zhesen Yang, A. P. Schnyder, Jiangping Hu +1
The fermion doubling theorem plays a pivotal role in Hermitian topological materials. It states, for example, that Weyl points must come in pairs in three-dimensional semimetals. H…
Ferromagnetic fluctuations in the Rashba-Hubbard model
Andrés Greco, Matías Bejas, Andreas P. Schnyder
We study the occurrence and the origin of ferromagnetic fluctuations in the longitudinal spin susceptibility of the --Rashba-Hubbard model on the square lattice. The combine…
Symmetry-enforced band crossings in trigonal materials: Accordion states and Weyl nodal lines
Y. -H. Chan, Berkay Kilic, Moritz M. Hirschmann +4
Nonsymmoprhic symmetries, such as screw rotations or glide reflections, can enforce band crossings within high-symmetry lines or planes of the Brillouin zone. When these band degen…
-symmetric non-Hermitian Dirac semimetals
W. B. Rui, Moritz M. Hirschmann, Andreas P. Schnyder
Parity-time () symmetry plays an important role both in non-Hermitian and topological systems. In non-Hermitian systems symmetry can lead to an entirel…
4D spinless topological insulator in a periodic electric circuit
Rui Yu, Y. X. Zhao, Andreas P. Schnyder
According to the mathematical classification of topological band structures, there exist a number of fascinating topological states in dimensions larger than three with exotic boun…
Topology and exceptional points of massive Dirac models with generic non-Hermitian perturbations
W. B. Rui, Y. X. Zhao, Andreas P. Schnyder
Recently, there has been a lot of activity in the research field of topological non-Hermitian physics, partly driven by fundamental interests and partly driven by applications in p…