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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - One-dimensional proximity superconductivity in the quantum Hall regime
AU - Barrier, Julien
AU - Xin, Na
AU - Kim, Minsoo
AU - Kumar, Roshan Krishna
AU - Kumaravadivel, Piranavan
AU - Hague, Lee
AU - Nguyen, Ekaterina
AU - Berdyugin, A. I.
AU - Moulsdale, Christian
AU - Enaldiev, Vladimir
AU - Prance, Jonathan
AU - Koppens, Frank
AU - Gorbachev, Roman
AU - Watanabe, Kenji
AU - Taniguchi, Takashi
AU - Glazman, Leonid
AU - Grigorieva, Irina
AU - Falko, Vladimir
AU - Geim, Andre
PY - 2024/4/25
Y1 - 2024/4/25
N2 - Extensive efforts have been undertaken to combine superconductivity and the quantum Hall effect so that Cooper-pair transport between superconducting electrodes in Josephson junctions is mediated by one-dimensional (1D) edge states. This interest has been motivated by prospects of finding new physics, including topologically-protected quasiparticles, but also extends into metrology and device applications. So far it has proven challenging to achieve detectable supercurrents through quantum Hall conductors. Here we show that domain walls in minimally twisted bilayer graphene support exceptionally robust proximity superconductivity in the quantum Hall regime, allowing Josephson junctions operational in fields close to the upper critical field of superconducting electrodes. The critical current is found to be non-oscillatory, practically unchanging over the entire range of quantizing fields, with its value being limited by the quantum conductance of ballistic strictly-1D electronic channels residing within the domain walls. The described system is unique in its ability to support Andreev bound states in high fields and offers many interesting directions for further exploration.
AB - Extensive efforts have been undertaken to combine superconductivity and the quantum Hall effect so that Cooper-pair transport between superconducting electrodes in Josephson junctions is mediated by one-dimensional (1D) edge states. This interest has been motivated by prospects of finding new physics, including topologically-protected quasiparticles, but also extends into metrology and device applications. So far it has proven challenging to achieve detectable supercurrents through quantum Hall conductors. Here we show that domain walls in minimally twisted bilayer graphene support exceptionally robust proximity superconductivity in the quantum Hall regime, allowing Josephson junctions operational in fields close to the upper critical field of superconducting electrodes. The critical current is found to be non-oscillatory, practically unchanging over the entire range of quantizing fields, with its value being limited by the quantum conductance of ballistic strictly-1D electronic channels residing within the domain walls. The described system is unique in its ability to support Andreev bound states in high fields and offers many interesting directions for further exploration.
U2 - 10.1038/s41586-024-07271-w
DO - 10.1038/s41586-024-07271-w
M3 - Journal article
VL - 628
SP - 741
EP - 745
JO - Nature
JF - Nature
SN - 0028-0836
IS - 8009
ER -