Detecting vortex motion through spatially correlated nonequilibrium noise
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arXiv
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| Natura: | Preprint |
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2026
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| _version_ | 1866910234594770944 |
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| author | Zhang, Yifan F. Samajdar, Rhine Gopalakrishnan, Sarang |
| author_facet | Zhang, Yifan F. Samajdar, Rhine Gopalakrishnan, Sarang |
| contents | Resistive transport near a superconducting phase can arise from the motion of normal-state quasiparticles or that of vortices. The conductivity alone does not distinguish between these mechanisms. We propose an unambiguous method for telling them apart, using the recently developed experimental tool of covariance magnetometry, which uses nitrogen-vacancy centers in diamond to probe real-time spatiotemporal correlations in magnetic noise. Our key insight is that, under an applied current, the underlying charge carriers leave a directional fingerprint in the spatially correlated magnetic noise above the sample: ordinary electric carriers drift parallel to the current, whereas vortices, owing to the Magnus force, drift perpendicular to it. The noise covariance detects this anisotropy and identifies the vortex-driven nature of transport. We compute the noise correlations expected for a representative thin-film superconductor and demonstrate that the anisotropic signal is well within the reach of current experimental capabilities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_18941 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Detecting vortex motion through spatially correlated nonequilibrium noise Zhang, Yifan F. Samajdar, Rhine Gopalakrishnan, Sarang Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics Resistive transport near a superconducting phase can arise from the motion of normal-state quasiparticles or that of vortices. The conductivity alone does not distinguish between these mechanisms. We propose an unambiguous method for telling them apart, using the recently developed experimental tool of covariance magnetometry, which uses nitrogen-vacancy centers in diamond to probe real-time spatiotemporal correlations in magnetic noise. Our key insight is that, under an applied current, the underlying charge carriers leave a directional fingerprint in the spatially correlated magnetic noise above the sample: ordinary electric carriers drift parallel to the current, whereas vortices, owing to the Magnus force, drift perpendicular to it. The noise covariance detects this anisotropy and identifies the vortex-driven nature of transport. We compute the noise correlations expected for a representative thin-film superconductor and demonstrate that the anisotropic signal is well within the reach of current experimental capabilities. |
| title | Detecting vortex motion through spatially correlated nonequilibrium noise |
| topic | Superconductivity Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2605.18941 |