Giant shot noise in superconductor/ferromagnet junctions with orbital-symmetry-controlled spin-orbit coupling

• URL: http://arxiv.org/abs/2509.15983v1
• Date: Fri, 19 Sep 2025 13:50:11 GMT
• Title: Giant shot noise in superconductor/ferromagnet junctions with orbital-symmetry-controlled spin-orbit coupling
• Authors: César González-Ruano, Chenghao Shen, Pablo Tuero, Coriolan Tiusan, Yuan Lu, Jong E. Han, Igor Žutić, Farkhad G. Aliev,
• Abstract summary: Measurements reveal largely unexplored implications of orbital-symmetry-controlled proximity effects.<n>We show that the enhanced shot noise, known from Josephson junctions with two superconductors, is measured even in a single superconductor.
• Score: 0.850910315887231
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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