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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.20598 |
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| _version_ | 1866915724846432256 |
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| author | Jeon, Kun-Rok Kim, Jae-Keun Yoon, Jiho Jeon, Jae-Chun Han, Hyeon Cottet, Audrey Kontos, Takis Parkin, Stuart S. P. |
| author_facet | Jeon, Kun-Rok Kim, Jae-Keun Yoon, Jiho Jeon, Jae-Chun Han, Hyeon Cottet, Audrey Kontos, Takis Parkin, Stuart S. P. |
| contents | The recent realization of zero-field, polarity-reversible supercurrent rectification in proximity-magnetized Rashba-type Pt Josephson junctions (JJs) enables the development of superconducting logic circuits and cryogenic memory applications. Here, we demonstrate a non-volatile anomalous phase shift ϕ_0 directly probed via superconducting quantum interferometry, providing phase-sensitive evidence of spontaneous time-reversal symmetry breaking in these Rashba-type systems. By replacing the Pt barrier with 5d or 4d element layers exhibiting different (para-)magnetic susceptibilities, spin-orbit coupling strengths, and electronic band structures, we elucidate the role of proximity effects in governing zero-field diode behavior. Ta (W) JJs exhibit zero-field diode efficiencies of ~17% (~5%) at 2 K, which are slightly (significantly) lower than those of Pt JJs. Notably, the diode polarity in Ta and W JJs is reversed relative to Pt JJs. Combined with the large zero-field diode efficiency (~15% at 2 K) observed in highly magnetic-susceptible Pd JJs, these results show that non-volatile ϕ_0 and, consequently, zero-field diode performance can be tuned through proximity engineering of interfacial magnetic ordering and Rashba spin-orbit interaction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_20598 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Interferometric evidence of non-volatile anomalous phase shifts in exchange-spin-split Josephson supercurrent diodes Jeon, Kun-Rok Kim, Jae-Keun Yoon, Jiho Jeon, Jae-Chun Han, Hyeon Cottet, Audrey Kontos, Takis Parkin, Stuart S. P. Superconductivity The recent realization of zero-field, polarity-reversible supercurrent rectification in proximity-magnetized Rashba-type Pt Josephson junctions (JJs) enables the development of superconducting logic circuits and cryogenic memory applications. Here, we demonstrate a non-volatile anomalous phase shift ϕ_0 directly probed via superconducting quantum interferometry, providing phase-sensitive evidence of spontaneous time-reversal symmetry breaking in these Rashba-type systems. By replacing the Pt barrier with 5d or 4d element layers exhibiting different (para-)magnetic susceptibilities, spin-orbit coupling strengths, and electronic band structures, we elucidate the role of proximity effects in governing zero-field diode behavior. Ta (W) JJs exhibit zero-field diode efficiencies of ~17% (~5%) at 2 K, which are slightly (significantly) lower than those of Pt JJs. Notably, the diode polarity in Ta and W JJs is reversed relative to Pt JJs. Combined with the large zero-field diode efficiency (~15% at 2 K) observed in highly magnetic-susceptible Pd JJs, these results show that non-volatile ϕ_0 and, consequently, zero-field diode performance can be tuned through proximity engineering of interfacial magnetic ordering and Rashba spin-orbit interaction. |
| title | Interferometric evidence of non-volatile anomalous phase shifts in exchange-spin-split Josephson supercurrent diodes |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2505.20598 |