Starts 9 Mar 2021 11:00
Ends 9 Mar 2021 12:00
Central European Time
Exceptional points (EPs) are ubiquitous in non-hermitian systems, and represent the complex counterpart of critical points. By driving a system through a critical point at finite rate induces defects, described by the Kibble-Zurek mechanism, which finds applications in diverse fields of physics. Here we generalize this to a ramp across an EP and demonstrate that for a variety of drives, the defect density scales as v^[−(d+z)ν/(zν+1]) in terms of the usual critical exponents and v the speed of the drive. Defect production is suppressed compared to the conventional hermitian case as the defect state can decay back to the ground state close to the EP. By using single-photon interferometry, we also reconstruct the above scaling experimentally.