Giant shot noise in superconductor/ferromagnet junctions with orbital-symmetry-controlled spin-orbit coupling
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| author | González-Ruano, César Shen, Chenghao Tuero, Pablo Tiusan, Coriolan Lu, Yuan Han, Jong E. Žutić, Igor Aliev, Farkhad G. |
| author_facet | González-Ruano, César Shen, Chenghao Tuero, Pablo Tiusan, Coriolan Lu, Yuan Han, Jong E. Žutić, Igor Aliev, Farkhad G. |
| contents | By measuring the shot noise, a consequence of charge quantization, in superconductor/insulator/ferromagnet (V/MgO/Fe) junctions, we discover a giant increase, orders of magnitude larger than expected. The origin of this giant noise is a peculiar realization of a superconducting proximity effect, where a simple superconductor influences its neighbors. Our measurements reveal largely unexplored implications of orbital-symmetry-controlled proximity effects. The importance of orbital symmetries and the accompanying spin-orbit coupling is manifested by an unexpected emergence of another superconducting region strikingly different from the parent superconductor. Unlike vanadium's common spin-singlet superconductivity, the broken inversion symmetry in V/MgO/Fe junctions and the resulting interfacial spin-orbit coupling leads to the formation of spin-triplet superconductivity across the ferromagnetic iron. Here we show that the enhanced shot noise, known from Josephson junctions with two superconductors, is measured even in a single superconductor, this discovery motivates revisiting how the spin-orbit coupling and superconducting proximity effects can transform many materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_15983 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Giant shot noise in superconductor/ferromagnet junctions with orbital-symmetry-controlled spin-orbit coupling González-Ruano, César Shen, Chenghao Tuero, Pablo Tiusan, Coriolan Lu, Yuan Han, Jong E. Žutić, Igor Aliev, Farkhad G. Superconductivity Quantum Physics By measuring the shot noise, a consequence of charge quantization, in superconductor/insulator/ferromagnet (V/MgO/Fe) junctions, we discover a giant increase, orders of magnitude larger than expected. The origin of this giant noise is a peculiar realization of a superconducting proximity effect, where a simple superconductor influences its neighbors. Our measurements reveal largely unexplored implications of orbital-symmetry-controlled proximity effects. The importance of orbital symmetries and the accompanying spin-orbit coupling is manifested by an unexpected emergence of another superconducting region strikingly different from the parent superconductor. Unlike vanadium's common spin-singlet superconductivity, the broken inversion symmetry in V/MgO/Fe junctions and the resulting interfacial spin-orbit coupling leads to the formation of spin-triplet superconductivity across the ferromagnetic iron. Here we show that the enhanced shot noise, known from Josephson junctions with two superconductors, is measured even in a single superconductor, this discovery motivates revisiting how the spin-orbit coupling and superconducting proximity effects can transform many materials. |
| title | Giant shot noise in superconductor/ferromagnet junctions with orbital-symmetry-controlled spin-orbit coupling |
| topic | Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2509.15983 |