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Annihilation of exceptional points from different Dirac valleys in a 2D photonic system

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dc.abstract.enTopological physics relies on Hamiltonian’s eigenstate singularities carrying topological charges, such as Dirac points, and – in non-Hermitian systems – exceptional points (EPs), lines or surfaces. So far, the reported non-Hermitian topological transitions were related to the creation of a pair of EPs connected by a Fermi arc out of a single Dirac point by increasing non-Hermiticity. Such EPs can annihilate by reducing non-Hermiticity. Here, we demonstrate experimentally that an increase of non-Hermiticity can lead to the annihilation of EPs issued from different Dirac points (valleys). The studied platform is a liquid crystal microcavity with voltage-controlled birefringence and TE-TM photonic spin-orbit-coupling. Non-Hermiticity is provided by polarization-dependent losses. By increasing the non-Hermiticity degree, we control the position of the EPs. After the intervalley annihilation, the system becomes free of any band singularity. Our results open the field of non-Hermitian valley-physics and illustrate connections between Hermitian topology and non-Hermitian phase transitions.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMuszyński, Marcin
dc.contributor.authorPiecek, Wiktor
dc.contributor.authorSzczytko, Jacek
dc.contributor.authorPiętka, Barbara
dc.contributor.authorMalpuech, G.
dc.contributor.authorSolnyshkov, D. D.
dc.contributor.authorLagoudakis, P. G.
dc.contributor.authorBardyszewski, Witold
dc.contributor.authorKula, Przemysław
dc.contributor.authorMorawiak, Przemysław
dc.contributor.authorMazur, Rafał
dc.contributor.authorŁempicka, Karolina
dc.contributor.authorKędziora, M.
dc.contributor.authorOliwa, Przemysław
dc.contributor.authorSeptembre, I.
dc.contributor.authorKról, Mateusz
dc.date.accessioned2024-01-24T16:39:50Z
dc.date.available2024-01-24T16:39:50Z
dc.date.copyright2022-09-12
dc.date.issued2022
dc.description.accesstimeAT_PUBLICATION
dc.description.financeŚrodki finansowe, o których mowa w art. 365 pkt. 2 ustawy
dc.description.number1
dc.description.versionFINAL_PUBLISHED
dc.description.volume13
dc.identifier.doi10.1038/S41467-022-33001-9
dc.identifier.issn2041-1723
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/100749
dc.identifier.weblinkhttps://www.nature.com/articles/s41467-022-33001-9.pdf
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofNature Communications
dc.relation.pages5340
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleAnnihilation of exceptional points from different Dirac valleys in a 2D photonic system
dc.typeJournalArticle
dspace.entity.typePublication