Proximity-induced high-temperature superconductivity in the topological insulators Bi 2 Se 3 and Bi 2 Te 3

Interest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive Majorana fermion at the interface between topological insulators and superconductors. Here we produce high-temperature superconductivity in Bi 2 Se₃ and Bi ₂ Te ₃ via proximity to Bi ₂ Sr₂ CaCu ₂ O ₈+δ, to access higher temperature and energy scales for this phenomenon. This was achieved by a new mechanical bonding technique that we developed, enabling the fabrication of high-quality junctions between materials, unobtainable by conventional approaches. We observe proximity-induced superconductivity in Bi ₂ Se 3 and Bi ₂ Te₃ persisting up to at least 80K-a temperature an order of magnitude higher than any previous observations. Moreover, the induced superconducting gap in our devices reaches values of 10mV, significantly enhancing the relevant energy scales. Our results open new directions for fundamental studies in condensed matter physics and enable a wide range of applications in spintronics and quantum computing.