Angular-momentum-selective nanofocusing with Weyl semimetals
Mesoscale and Nanoscale Physics
2025-11-14 v2
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.
Cite
@article{arxiv.2506.18503,
title = {Angular-momentum-selective nanofocusing with Weyl semimetals},
author = {Marco Peluso and Alessandro De Martino and Reinhold Egger and Francesco Buccheri},
journal= {arXiv preprint arXiv:2506.18503},
year = {2025}
}
Comments
11 pages, 6 figures. v2: improved Figs. 3 and 4 show more SPP modes, added Fig. 6. Extended discussion in Secs. IV.a and V. References added. Accepted version