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

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

Research output: Contribution to journalArticle

Abstract

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 Bi 2 Se 3 . We apply in-plane and out-of-plane magnetic fields to proximity-coupled Bi 2 Se 3 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.

Original languageEnglish (US)
Article number3478
JournalNature communications
Volume9
Issue number1
DOIs
StatePublished - Dec 1 2018

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Josephson junctions
Momentum
insulators
Superconductivity
momentum
Magnetic Fields
superconductivity
Exchange coupling
Zeeman effect
Magnetism
Equipment and Supplies
proximity
Research
signatures
Magnetic fields
Fluxes
magnetic fields
simulation

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

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; Gilbert, Matthew; Mason, Nadya.

In: Nature communications, Vol. 9, No. 1, 3478, 01.12.2018.

Research output: Contribution to journalArticle

Chen, Angela Q. ; Park, Moon Jip ; Gill, Stephen T. ; Xiao, Yiran ; Reig-i-Plessis, Dalmau ; MacDougall, Gregory ; Gilbert, Matthew ; Mason, Nadya. / Finite momentum Cooper pairing in three-dimensional topological insulator Josephson junctions. In: Nature communications. 2018 ; Vol. 9, No. 1.
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