Two-dimensional quadratic Weyl point, nodal loop, and spin-orbit Dirac point in monolayers PtS, PtSe, and PtTe

Topological quasiparticles have garnered significant research attention in condensed matter physics. However, they are exceedingly rare in two-dimensional systems, particularly those hosting unconventional topological quasiparticles. In this work, employing first-principles...