Finite momentum Cooper pairing in three-dimensional topological insulator Josephson junctions

Chen, Angela Q.; Park, Moon Jip; Gill, Stephen T.; Xiao, Yiran; Reig-i-Plessis, Dalmau; MacDougall, Gregory J.; Gilbert, Matthew J.; Mason, Nadya

doi:10.1038/s41467-018-05993-w

Title: Finite momentum Cooper pairing in three-dimensional topological insulator Josephson junctions

Journal Article · 28 August 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-05993-w · OSTI ID:1465880

Chen, Angela Q. ^[1]; Park, Moon Jip ^[1]; Gill, Stephen T. ^[1]; Xiao, Yiran ^[1]; Reig-i-Plessis, Dalmau ^[1]; MacDougall, Gregory J. ^[1]; Gilbert, Matthew J. ^[2]; Mason, Nadya ^[1]

Univ. of Illinois, Urbana, IL (United States). Dept. of Physics and Frederick Seitz Materials Research Lab.
Univ. of Illinois, Urbana, IL (United States). Dept. of Electrical and Computer Engineering

Unconventional superconductivity arising from the interplay between strong spin–orbit coupling and magnetism is an intensive area of research. One form of unconventional superconductivity arises when Cooper pairs subjected to a magnetic exchange coupling acquire a finite momentum. Here, we report on a signature of finite momentum Cooper pairing in the three-dimensional topological insulator Bi₂Se₃. We apply in-plane and out-of-plane magnetic fields to proximity-coupled Bi₂Se₃ and find that the in-plane field creates a spatially oscillating superconducting order parameter in the junction as evidenced by the emergence of an anomalous Fraunhofer pattern. We describe how the anomalous Fraunhofer patterns evolve for different device parameters, and we use this to understand the microscopic origin of the oscillating order parameter. The agreement between the experimental data and simulations shows that the finite momentum pairing originates from the coexistence of the Zeeman effect and Aharonov–Bohm flux.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0012368

OSTI ID:: 1465880

Alternate ID(s):: OSTI ID: 1511469

Journal Information:: Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Title: Finite momentum Cooper pairing in three-dimensional topological insulator Josephson junctions

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