Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3

Parisa Zareapour, Alex Hayat, Shu Yang F. Zhao, Michael Kreshchuk, Achint Jain, Daniel C. Kwok, Nara Lee, Sang-Wook Cheong, Zhijun Xu, Alina Yang, G.D. Gu, Shuang Jia, Robert J. Cava and Kenneth S. Burch ()
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Parisa Zareapour: University of Toronto
Alex Hayat: University of Toronto
Shu Yang F. Zhao: University of Toronto
Michael Kreshchuk: University of Toronto
Achint Jain: University of Toronto
Daniel C. Kwok: Rutgers University
Nara Lee: Rutgers University
Sang-Wook Cheong: Rutgers University
Zhijun Xu: Brookhaven National Laboratory
Alina Yang: Brookhaven National Laboratory
G.D. Gu: Brookhaven National Laboratory
Shuang Jia: Princeton University
Robert J. Cava: Princeton University
Kenneth S. Burch: University of Toronto

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: Abstract 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 Bi2Se3 and Bi2Te3 via proximity to Bi2Sr2CaCu2O8+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 Bi2Se3 and Bi2Te3 persisting up to at least 80 K—a temperature an order of magnitude higher than any previous observations. Moreover, the induced superconducting gap in our devices reaches values of 10 mV, 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.

Date: 2012
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DOI: 10.1038/ncomms2042

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