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Magnetic lightning in superconducting films

Date: 2023-12-12
Time: 09:30
Venue: M253
Speaker: Professor Alejandro V. Silhanek

Experimental Physics of Nanostructured Materials, Q-MAT, CESAM,

Université de Liège, B-4000 Sart Tilman, Belgium

Magnetic flux lines in superconductors are topologically-protected quantum objects which can be deformed when moving at very high velocities. These extreme conditions can be transitorily realized when superconductors undergo a thermomagnetic instability for which the sample topology come also into play. In this work, we explore the complex pattern of magnetic field penetration and identify its impact on the resonance frequency of NbTiN and Nb superconducting resonators by combining magneto-optical imaging and high-frequency measurements. We will also discuss the possibility to improve the performance of superconducting films by introducing periodic surface structures by means of a femtosecond UV laser.

Alejandro Silhanek is a professor of Department of Physics, Faculty of Sciences at the University of Liège, Belgium. He holds a master degree in physics from the University of La Plata, Argentina, and a Ph.D. degree in Physics obtained from Instituto Balseiro, Bariloche (Argentina) in 2001. He was awarded Directors funded Postdoctoral fellow, Los Alamos National Laboratory (USA) from 2004 to 2006 and Postdoctoral Researcher FWO (Belgium) from 2006 to 2011. The scientific activities of his group are mainly within the field of experimental mesoscopic physics, nanoscience and nanotechnology, magnetism, superconductivity, and quantum transport.

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