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Nodal phases in non...
Nodal phases in non-Hermitian wallpaper crystals
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- König, J. Lukas K., 1996- (författare)
- Stockholms universitet,Fysikum
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- Herber, Felix (författare)
- Stockholms universitet,Fysikum
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- Johansson Bergholtz, Emil, Professor, 1978- (författare)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- 2024
- 2024
- Engelska.
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Ingår i: Applied Physics Letters. - 0003-6951 .- 1077-3118. ; 124:5
- Relaterad länk:
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https://doi.org/10.1...
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visa fler...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Symmetry and non-Hermiticity play pivotal roles in photonic lattices. While symmetries, such as parity-time (PT) symmetry, have attracted ample attention, more intricate crystalline symmetries have been neglected in comparison. Here, we investigate the impact of the 17 wallpaper space groups of two-dimensional crystals on non-Hermitian band structures. We show that the non-trivial space group representations enforce degeneracies at high symmetry points and dictate their dispersion away from these points. In combination with either T or PT, the symmorphic p4 mm symmetry and the non-symmorphic p2mg, p2gg, and p4gm symmetries protect exceptional chains intersecting at the pertinent high symmetry points.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- non-hermitian
- photonic crystal
- lattice model
- Physics
- fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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