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MA: Fachverband Magnetismus

MA 30: Focus Session: Topological Defects in Superconductors and Magnets (joint session TT/MA)

MA 30.2: Hauptvortrag

Mittwoch, 14. März 2018, 15:30–16:00, H 0104

Optical Manipulation of Single Flux Quanta — •Philippe Tamarat — LP2N, Université de Bordeaux, Institut d'Optique Graduate School and CNRS, France

The semiconductor electronics scaling road map will probably reach its physical fundamental limits within the next decade. Alternative technologies such as superconducting electronics are appealing due to higher operating frequencies together with fundamentally lower switching energies. In this context, a promising method requires the manipulation of individual flux quanta close to a Josephson junction. Yet, handling of individual vortices remains challenging and has been performed only with local probe scanning microscopies, slow techniques that are heavy to implement in a cryogenic environment.

We introduce the concept of laser manipulation of individual flux quanta, based on local heating of the superconductor with a focused laser beam to realize a fast, precise and non-invasive manipulation of an Abrikosov vortex, in the same way as with optical tweezers. This simple and far-field optical method provides a perfect basis for sculpting the magnetic flux profile in superconducting devices like a vortex lens or a vortex cleaner. Various regimes of vortex manipulation are achieved, from the precise and rapid positioning of individual vortices to the generation of tight vortex bunches. This method will fuel fundamental investigations of the vortex matter and open up new research directions in quantum computation based on Josephson junctions. I will also present our latest advances towards the creation of Abrikosov vortices with light.