Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Optomechanics I
Q 12.8: Vortrag
Montag, 10. März 2025, 18:45–19:00, HS I
Dynamics of ellipsoidal superconductors levitated in magnetic quadrupole traps — •Fynn Köller1, Klaus Hornberger2, and Benjamin Stickler1 — 1Ulm University, Institute for Complex Quantum Systems, Ulm, Germany — 2University of Duisburg-Essen, Faculty of Physics, Duisburg, Germany
Superconducting bodies can be diamagnetically levitated in magnetic quadrupole traps, where their dynamics is governed by the internal magnetization field induced by the trapping field. We derive an analytical expression for the internal magnetization in ellipsoidal bodies. The induced dipole and quadrupole moments give rise to diamagnetic forces and torques as well as to spin-rotation coupling due to the Einstein-de Haas and Barnett effects, enabling full three-dimensional alignment in the trap center. We investigate how spin-angular momentum of superconductors can be observed through their motion and how the resulting dynamics can be measured, controlled and eventually cooled in upcoming experiments with levitated micron-sized superconductors.
Keywords: superconductor; levitated; magnetic quadrupole trap; Einstein-de Haas effect; Barnett effect