Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Scanning Probe Techniques: Method Development
O 16.9: Vortrag
Montag, 17. März 2025, 17:00–17:15, H25
Scanning Quantum Microscopy for 2D Superconductors — •Ruoming Peng1, Malik Lenger1, Sreehari Jayaram1, and Joerg Wrachtrup1,2 — 13. Physikalisches Institut, University of Stuttgart, 70569 Stuttgart, Germany — 2Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
Visualization of nanoscale dynamics in 2D superconductors provides critical insights into pairing mechanisms and topological electronic responses. Using state-of-the-art scanning quantum microscopy based on nitrogen-vacancy (NV) centers in diamonds, we investigate the local magnetic behavior of the 2D superconductor 2H-NbSe2 with high sensitivity and spatial resolution. This approach enables the first spatial-temporal measurements of vortex dynamics in thin exfoliated 2H-NbSe2, revealing a strong correlation between vortex arrangements and geometric confinement. We observe the melting transition of vortex solids near the critical temperature, alongside cooling-rate-dependent vortex rearrangements across thermal cycles. Additionally, through local magnetic noise probing via spin coherence time (T2) measurements, we uncover unexpected supercurrent fluctuations in reduced dimensionality. These findings highlight the potential of scanning quantum microscopy in advancing our understanding of vortex physics and emergent phenomena in 2D superconducting systems.
Keywords: NV center; Quantum Sensing; 2D superconductor; Vortex melting; Josephson Vortex