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Angular-momentum-selective nanofocusing with Weyl semimetals

Marco Peluso1, Alessandro De Martino2, Reinhold Egger3, and Francesco Buccheri1,4

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Phys. Rev. Research 7, 043121 – Published 31 October, 2025

DOI: https://doi.org/10.1103/8c99-rvmm

Abstract

We investigate the theory of surface plasmon polaritons on a magnetic Weyl semimetal conical tip. We show that the axion term in the effective electrodynamics modifies the surface plasmon polariton dispersion relation and allows all modes with a given sign of the orbital angular momentum to be focused at the end of the tip. This is in contrast with normal metals, in which only one mode can reach the end. We discuss how this orbital angular momentum nanofocusing expands the potential of technologies that use this degree of freedom.

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Phys. Rev. Research 7, 043121– Published 31 October, 2025
  • Received 30 June 2025
  • Accepted 2 October 2025
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