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

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

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1465880
Alternate Identifier(s):
OSTI ID: 1511469
Grant/Contract Number:  
SC0012368
Resource Type:
Journal Article: Published Article
Journal Name:
Nature Communications
Additional Journal Information:
Journal Name: Nature Communications Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Chen, Angela Q., Park, Moon Jip, Gill, Stephen T., Xiao, Yiran, Reig-i-Plessis, Dalmau, MacDougall, Gregory J., Gilbert, Matthew J., and Mason, Nadya. Finite momentum Cooper pairing in three-dimensional topological insulator Josephson junctions. United Kingdom: N. p., 2018. Web. doi:10.1038/s41467-018-05993-w.
Chen, Angela Q., Park, Moon Jip, Gill, Stephen T., Xiao, Yiran, Reig-i-Plessis, Dalmau, MacDougall, Gregory J., Gilbert, Matthew J., & Mason, Nadya. Finite momentum Cooper pairing in three-dimensional topological insulator Josephson junctions. United Kingdom. doi:10.1038/s41467-018-05993-w.
Chen, Angela Q., Park, Moon Jip, Gill, Stephen T., Xiao, Yiran, Reig-i-Plessis, Dalmau, MacDougall, Gregory J., Gilbert, Matthew J., and Mason, Nadya. Tue . "Finite momentum Cooper pairing in three-dimensional topological insulator Josephson junctions". United Kingdom. doi:10.1038/s41467-018-05993-w.
@article{osti_1465880,
title = {Finite momentum Cooper pairing in three-dimensional topological insulator Josephson junctions},
author = {Chen, Angela Q. and Park, Moon Jip and Gill, Stephen T. and Xiao, Yiran and Reig-i-Plessis, Dalmau and MacDougall, Gregory J. and Gilbert, Matthew J. and Mason, Nadya},
abstractNote = {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.},
doi = {10.1038/s41467-018-05993-w},
journal = {Nature Communications},
issn = {2041-1723},
number = 1,
volume = 9,
place = {United Kingdom},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1038/s41467-018-05993-w

Citation Metrics:
Cited by: 6 works
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