Giant Dynamical Paramagnetism: From the High-Tc Cuprate Pseudogap to Ultrafast Spin Detection

by Dr Marios Manos ((MPI PKS Dresden))

Wednesday 3 Jun 2026, 10:00 → 11:00 Europe/Zurich

OSGA/EG6b

In this talk, I will discuss an instability that is present when optically pumping superconducting layers that are Josephson coupled in the presence of a magnetic field. Remarkably, this instability survives the high temperature phase disordering superconducting to metal transition as long as there is local pairing correlations. Applied to the case of cuprate superconductors and specifically the underdoped bilayer YBa2Cu3O6+x, this instability can be used to probe ultra-local pairing correlations that are typically hidden in transport measurements and other linear response probes[1]. I will argue that beyond the cuprates this instability can be generally exploited to probe local pairing correlations in fluctuating superconductors.

In the second part of the talk I will describe how such instability could be used to detect small magnetic fields on ultra-fast time scales in long Josephson junction superconducting devices.[2]

[1] arXiv:2410.12919: Giant Dynamical Paramagnetism in the driven pseudogap phase of YBa2Cu3O6+x, M. H. M., Duilio De Santis, Eugene A. Demler, Patrick A. Lee

[2] soon to be published results.