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We show that two different superconducting phases exist at high pressures inthe optimized tetradymite topological insulators Bi2Te2Se (BTS) andBi1.1Sb0.9Te2S (BSTS). The superconducting phases emerge at structural phasetransitions, the first at 8.4 GPa for BTS and 12.4 GPa for BSTS, and the secondat 13.6 GPa for BTS and 20.4 GPa, for BSTS. Electronic structure calculationsshow that these phases do not have topological character. Comparison of ourresults with prior work on Bi2Se3, Bi2Te3 and (Bi,Sb)2(Se,Te)3 allows us touncover a universal phase diagram for pressure-induced superconductivity intetradymites, providing a basis for understanding the relationships betweentopological behavior, crystal structure, and superconductivity for thesematerials.

Universal superconductivity phase diagram for pressurized tetradymite topological insulators