  Recently monolayer jacutingaite (Pt2HgSe3), a naturally occurring exfoliable
mineral, discovered in Brazil in 2008, has been theoretically predicted as a
candidate quantum spin Hall system with a 0.5 eV band gap, while the bulk form
is one of only a few known dual-topological insulators which may host different
surface states protected by symmetries. In this work, we systematically
investigate both structure and electronic evolution of bulk Pt2HgSe3 under high
pressure up to 96 GPa. The nontrivial topology persists up to the structural
phase transition observed in the high-pressure regime. Interestingly, we found
that this phase transition is accompanied by the appearance of
superconductivity at around 55 GPa and the critical transition temperature Tc
increases with applied pressure. Our results demonstrate that Pt2HgSe3 with
nontrivial topology of electronic states displays new ground states upon
compression and raises potentials in application to the next-generation
spintronic devices.
