ArXiv · 2026
We address the quantum geometric structure of plasmons in Fermi surfaces enclosing a topological charge. We demonstrate that Weyl fermion plasmons have monopole structure, are topological and have a finite vorticity ζ=2C_w, where C_w is the Chern number of the Fermi surface enclosing the Weyl point. We show that these plasmons selectively couple to light linearly polarized along the plasmon effective dipole moment d, which has quantum geometric origin and points along the direction of the plasmon center of mass momentum Q̂. We suggest that Weyl metal topological plasmons have distinctive optical properties compared to conventional plasmons.
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