Vortex manipulation: from collective behavior to single-vortex

The dynamics of quantized magnetic vortices determine the electromagnetic properties of superconductors, particularly their ability to carry non-dissipative currents. Moreover, single-vortex manipulation is essential to probe its properties and manipulate classical or quantum information. This seminar will discuss two specific limits: the many vortex flux flow regime and single-vortex manipulation on submicron scales. In particular, we will the superconducting vortex diode effect based on superconducting/ferromagnetic (S/F) heterostructure1,2. Here, we observe a tunable superconducting vortex diode in Nb/EuS (S/F) bilayers3. Based on our nanoscale SQUID-on-tip (SOT) microscope4 and supported by in-situ transport measurements, we propose a theoretical model that captures our key results. We will also present a chip-integrated device that allows single-vortex manipulation5. We will demonstrate that this device could be used for large-scale topological quantum computing.