[Billthedrill]

...the material's unique crystalline structure produces Rarita-Schwinger fermions in its interior and extremely long quadruple topological Fermi arcs on its surface.

I was just going to say that...

[Ken H]

“...extremely long quadruple topological Fermi arcs on its surface.”

I always thought it was triple topological Fermi arcs on its surface. Man do I feel stupid.