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Quasi-particle excitations in solids described by the Weyl equation haveattracted significant attention in recent years. Thus far, a wide range ofsolids that have been experimentally realized as Weyl semimetals (WSMs) lackeither mirror or inversion symmetry. For the first time, in the absence of bothmirror and inversion symmetry, SrSi2 has been predicted as a robust WSM byrecent theoretical works. Herein, supported by first-principles calculations,we present systematic angle-resolved photoemission studies of undoped SrSi2 andCa-doped SrSi2 single crystals. Our results show no evidence of the predictedWeyl fermions at the kz = 0 plane or the Fermi arcs on the (001) surface. Withexternal pressure, the electronic band structure evolved and induced Weylfermions in this compound, as revealed by first-principle calculations combinedwith electrical transport property measurements. Moreover, a superconductingtransition was observed at pressures above 20 GPa. Our investigations indicatethat the SrSi2 system is a good platform for studying topological transitionsand correlations with superconductivity.

Observation of pressure-induced Weyl state and superconductivity in a chirality-neutral Weyl semimetal candidate SrSi2