Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 24: Focus Session: Quantum Sensing with Solid State Spin defects I (joint session TT/MA)
TT 24.6: Talk
Tuesday, March 10, 2026, 12:15–12:30, HSZ/0003
Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope — •Malik Lenger1, Sreehari Jayaram1, Lucas Pupim2, Ruoming Peng1, Mathias Scheurer2, Jurgen Smet3, and Jörg Wrachtrup1, 3 — 13rd Institute of Physics, University Stuttgart, Stuttgart, Germany — 2Institute for Theoretical Physics III, University Stuttgart, Stuttgart, Germany — 3Max Planck Institute for Solid State Research, Stuttgart, Germany
Magnetic dynamics at the nanoscale provide crucial insight into the behavior of superconductors. Using single-spin scanning quantum microscopy, we probe vortex dynamics in the two-dimensional superconductor NbSe2. Our measurements reveal a disordered vortex glass phase that melts near the critical temperature and displays cooling-rate-dependent configurations. Surprisingly, magnetic noise persists well below Tc, with a strength that increases at lower temperatures - contrary to expectations. This behavior, detected via spin decoherence, points to an intrinsic origin driven by competition between supercurrent density and thermal fluctuations. Our results establish single-spin microscopy as a powerful platform for investigating fluctuations in 2D superconductors.
Keywords: Superconductivity; Vortices in superconductors; Transition metal dichalcogenides; Type-II superconductors; Scanning probe microscopy