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Quantum Spin Hall (QSH) insulators possess distinct helical in-gap states,enabling their edge states to act as one-dimensional conducting channels whenbackscattering is prohibited by time-reversal symmetry. However, it remainschallenging to achieve high-performance combinations of nontrivial topologicalQSH states with superconductivity for applications and requires understandingof the complicated underlying mechanisms. Here, our experimental observationsfor a novel superconducting phase in the pressurized QSH insulator Ta2Pd3Te5 isreported, and the high-pressure phase maintains its original ambient pressurelattice symmetry up to 45 GPa. Our in-situ high-pressure synchrotron X-raydiffraction, electrical transport, infrared reflectance, and Raman spectroscopymeasurements, in combination with rigorous theoretical calculations, providecompelling evidence for the association between the superconducting behaviorand the abnormal densified phase. The isostructural transition was found tomodify the topology of the Fermi surface directly, accompanied by a fivefoldamplification of the density of states at 20 GPa compared to ambient pressure,which synergistically fosters the emergence of robust superconductivity. Aprofound comprehension of the fascinating properties exhibited by thecompressed Ta2Pd3Te5 phase is achieved, highlighting the extraordinarypotential of van der Waals (vdW) QSH insulators for exploring and investigatinghigh-performance electronic advanced devices under extreme conditions.

Observation of Emergent Superconductivity in the Quantum Spin Hall Insulator Ta2Pd3Te5 via Pressure Manipulation