Pseudospin-2 in photonic chiral borophene

Pseudospin is an angular momentum degree of freedom introduced in analogy to the real electron spin in the effective massless Dirac-like equation used to describe wave evolution at conical intersections such as the Dirac cones of graphene. Here, we study a photonic implementation of a chiral borophe...

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Veröffentlicht in:Photonics research (Washington, DC) DC), 2023-05, Vol.11 (5), p.869
Hauptverfasser: Menz, Philip, Hanafi, Haissam, Leykam, Daniel, Imbrock, Jörg, Denz, Cornelia
Format: Artikel
Sprache:eng
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Zusammenfassung:Pseudospin is an angular momentum degree of freedom introduced in analogy to the real electron spin in the effective massless Dirac-like equation used to describe wave evolution at conical intersections such as the Dirac cones of graphene. Here, we study a photonic implementation of a chiral borophene allotrope hosting a pseudospin-2 conical intersection in its energy–momentum spectrum. The presence of this fivefold spectral degeneracy gives rise to quasiparticles with pseudospin up to ±2. We report on conical diffraction and pseudospin–orbit interaction of light in photonic chiral borophene, which, as a result of topological charge conversion, leads to the generation of highly charged optical phase vortices.
ISSN:2327-9125
2327-9125
DOI:10.1364/PRJ.486916