@misc{shouya2026a,
  title = {Topological charges, Fermi arcs, and surface states of
                      <math>
                        <msub>
                          <mi>K</mi>
                          <mn>4</mn>
                        </msub>
                      </math>
                      crystal},
  author = {Shouya Yoshida, Katsuhiro Takahashi, Katsunori Wakabayashi},
  publisher = {American Physical Society (APS)},
  year = {2026-02-05},
  keywords = {K4 crystal, Gyroid lattice, Weyl point, Fermi arc, topological charge, Berry curvature, surface state}
}