  Topological semimetals such as Weyl or Dirac semimetals with
superconductivity have emerged as a new class of topological materials to
realize and study Majorana Fermion. This article reports the Density Functional
Theory (DFT) calculated bulk electronic band structure of recently discovered
topological superconductor candidate AuSn4. The study has been performed on
AuSn4 considering two space groups symmetries viz. Aea2 and Ccce, as reported
earlier. This study is further extended to the calculation of Z2 invariants.
The Fermi surfaces corresponding to the bands, which are responsible for
non-trivial band topology, along with the surface states, are also mapped. The
complete study suggests that AuSn4 is a topological semimetal. On AuSn4, it is
the first report in the literature showing the non-trivial band topology based
on first-principle calculations.
