Twisted light control with Weyl semimetals

Datum

16.09.2025

Zeit

11:00 - 12:00

Sprecher

Dr. Francesco Buccheri

Zugehörigkeit

Politecnico di Torino

Sprache

en

Hauptthema

Materialien

Host

Grit Rötzer

Beschreibung

Twisted light [1] can carry large amounts of information over long distances, and selectively induce atomic and molecular transitions. Therefore, it holds significant promise for quantum computation and sensing technologies. In this talk, I will argue that magnetic Weyl semimetals can be used to effectively manipulate twisted light. Because of the presence of an axionic term in the emergent electrodynamics [2], a giant nonreciprocity in the surface plasmon polariton dispersions emerges. This effect will become apparent by observing the propagation direction of surface modes in a cylindrical waveguide. Moreover, it predicts that a conical Weyl semimetal tip will be able to focus surface plasmon polariton modes selectively, depending on the sign of their orbital angular momentum [3]. [1] L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, and J. P. Woerdman, "Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes" , Phys. Rev. A 45, 8185 (1992) [2] A. A. Zyuzin and A. A. Burkov, "Topological response in Weyl semimetals and the chiral anomaly", Phys. Rev. B 86, 115133 (2012); [3] M. Peluso, A. De Martino, R. Egger, and F. Buccheri, "Nonreciprocal Weyl semimetal waveguide", Phys. Rev. Research 7, 023195 (2025) & "Angular-momentum-selective nanofocusing with Weyl semimetals", arXiv:2506.18503. .

Links

• Seminars at the IFW

Letztmalig verändert: 16.09.2025, 07:36:46