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<p>We propose that unconventional Josephson effects can typically emerge in <i>PT</i>-symmetric antiferromagnetic (AFM) bilayer systems. When proximitized by a conventional superconductor, these heterostructures host dominant interlayer pairing correlation that features a distinctive spin texture enabled by the strong exchange field. Specifically, we demonstrate a novel mechanism for electrically tunable 0-<i>π</i> oscillations in lateral Josephson junctions, controlled by an out-of-plane electric displacement field. This behavior originates from field-induced finite-momentum pairing correlation, a hallmark of the unique layer-pseudospin structure in <i>PT</i>-symmetric AFM bilayers. Furthermore, we introduce a AFM Josephson spin valve based on these exotic proximity-induced spin-layer-locked pairing correlation, in which the supercurrent exhibits a strong dependence on the internal Néel order. Our findings establish <i>PT</i>-symmetric AFM bilayers as a versatile platform for phase-controllable Josephson junctions and superconducting magnetic random-access memory, with promising applications in superconducting circuits and ultralow-power computing.</p>

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Electrically controlled 0-π oscillations and antiferromagnetic Josephson spin valve with PT symmetry

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月9日

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  • Jin-Xin Hu,
  • Mengli Hu,
  • Ying-Ming Xie,
  • K. T. Law

摘要

We propose that unconventional Josephson effects can typically emerge in PT-symmetric antiferromagnetic (AFM) bilayer systems. When proximitized by a conventional superconductor, these heterostructures host dominant interlayer pairing correlation that features a distinctive spin texture enabled by the strong exchange field. Specifically, we demonstrate a novel mechanism for electrically tunable 0-π oscillations in lateral Josephson junctions, controlled by an out-of-plane electric displacement field. This behavior originates from field-induced finite-momentum pairing correlation, a hallmark of the unique layer-pseudospin structure in PT-symmetric AFM bilayers. Furthermore, we introduce a AFM Josephson spin valve based on these exotic proximity-induced spin-layer-locked pairing correlation, in which the supercurrent exhibits a strong dependence on the internal Néel order. Our findings establish PT-symmetric AFM bilayers as a versatile platform for phase-controllable Josephson junctions and superconducting magnetic random-access memory, with promising applications in superconducting circuits and ultralow-power computing.