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arXiv 2402.14451cond-mat.mes-hallcond-mat.supr-con
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量子霍尔区中的一维近邻超导

One-dimensional proximity superconductivity in the quantum Hall regime

Julien Barrier, Minsoo Kim, Roshan Krishna Kumar, Na Xin, P. Kumaravadivel, Lee Hague, E. Nguyen, A. I. Berdyugin, Christian Moulsdale, V. V. Enaldiev, J. R. Pr… 展开作者

Julien Barrier, Minsoo Kim, Roshan Krishna Kumar, Na Xin, P. Kumaravadivel, Lee Hague, E. Nguyen, A. I. Berdyugin, Christian Moulsdale, V. V. Enaldiev, J. R. Prance, F. H. L. Koppens, R. V. Gorbachev, K. Watanabe, T. Taniguchi, L. I. Glazman, I. V. Grigorieva, V. I. Fal'ko, A. K. Geim

AI总结:

研究通过微小扭转双层石墨烯畴壁在量子霍尔区实现稳健的一维近邻超导,使约瑟夫森结在接近上临界磁场下工作,临界电流不随磁场振荡且受限于一维电子通道量子电导,支持Andreev束缚态。

摘要:

人们已付出大量努力将超导与量子霍尔效应结合起来,使得约瑟夫森结中超导电极间的库珀对输运由一维边缘态介导。这一兴趣受到寻找包括拓扑保护准粒子在内的新物理前景的推动,同时也延伸至计量学和器件应用。迄今为止,实现可检测的通过量子霍尔导体的超流仍极具挑战。在此我们表明,微小扭转双层石墨烯中的畴壁在量子霍尔区支持异常稳健的近邻超导,使约瑟夫森结能够在接近超导电极上临界磁场的磁场下工作。临界电流在整个量子化磁场范围内不发生振荡且几乎保持不变,其数值受限于位于畴壁内弹道、严格一维电子通道的量子电导。所描述的系统在量子化磁场下支持Andreev束缚态的能力上独具特色,并为后续探索提供了许多有趣的方向。

英文摘要:

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 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 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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