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Analysis reveals that Weyl semimetals enable efficient nanofocusing of surface plasmon polaritons with orbital angular momentum, suggesting advancements in related technologies.
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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Peluso et al. (2025) studied this question.
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