Hybridization-gap Formation and Superconductivity in the Pressure-induced Semimetallic Phase of the Excitonic Insulator Ta${}_2$NiSe${}_5$

Kazuyuki Matsubayashi, Hidekazu Okamura, Takashi Mizokawa +19

The excitonic insulator Ta${}_2$NiSe${}_5$ experiences a first-order structural transition under pressure from rippled to flat layer-structure at Ps = 3 GPa, which drives the system fr…