One-dimensional proximity superconductivity in the quantum Hall regime
成果类型：
Article
署名作者：
Barrier, Julien; Kim, Minsoo; Kumar, Roshan Krishna; Xin, Na; Kumaravadivel, P.; Hague, Lee; Nguyen, E.; Berdyugin, A. I.; Moulsdale, Christian; Enaldiev, V. V.; Prance, J. R.; Koppens, F. H. L.; Gorbachev, R. V.; Watanabe, K.; Taniguchi, T.; Glazman, L. I.; Grigorieva, I. V.; Fal'ko, V. I.; Geim, A. K.
署名单位：
University of Manchester; University of Manchester; Kyung Hee University; Barcelona Institute of Science & Technology; Universitat Politecnica de Catalunya; Institut de Ciencies Fotoniques (ICFO); Zhejiang University; Lancaster University; National Institute for Materials Science; Yale University; University of Manchester
刊物名称：
Nature
ISSN/ISSBN：
0028-6284
DOI：
10.1038/s41586-024-07271-w
发表日期：
2024-04-25
关键词：
摘要：
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 edge states1-6. This interest has been motivated by prospects of finding new physics, including topologically protected quasiparticles7-9, but also extends into metrology and device applications10-13. So far it has proven challenging to achieve detectable supercurrents through quantum Hall conductors2,3,6. Here we show that domain walls in minimally twisted bilayer graphene14-18 support exceptionally robust proximity superconductivity in the quantum Hall regime, allowing Josephson junctions to operate in fields close to the upper critical field of superconducting electrodes. The critical current is found to be non-oscillatory and practically unchanging over the entire range of quantizing fields, with its value being limited by the quantum conductance of ballistic, strictly one-dimensional, electronic channels residing within the domain walls. The system described is unique in its ability to support Andreev bound states at quantizing fields and offers many interesting directions for further exploration. We show that domain walls in minimally twisted bilayer graphene support exceptionally robust proximity superconductivity in the quantum Hall regime.