Fig. 3 | npj Quantum Materials

Fig. 3

From: Pressure-induced superconductivity and topological quantum phase transitions in a quasi-one-dimensional topological insulator: Bi4I4

Fig. 3

Electronic P-T phase diagram for β-Bi4I4. a Superconducting Tc is shown as function of pressure. The green and blue circles represent the Tc extracted from different resistivity measurements. As the pressure increases to ≈13 GPa, superconductivity is observed above experimental Tmin and persists up to pressures near 40 GPa. A dome-like evolution is observed with a maximum Tc of 6 K attained at P = 23 GPa. The resistivity values at 300 K are also shown. The resistivity of β-Bi4I4 exhibits a more complicated feature, which demonstrates that high pressure dramatically alters the electronic properties in β-Bi4I4. b Schematic illustrations of the band structure evolution under various pressures. In the STI phase, band inversion occurs at one time-reversal-invariant momentum (TRIM) points of the Brillouin zone; however, in the WTI phase, band inversion occurs at two TRIM points. In metals the Fermi level crosses the bands

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