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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum Optomechanics I

Q 12.5: Vortrag

Montag, 10. März 2025, 18:00–18:15, HS I

Rotational dynamics of Meissner-levitated micromagnets — •Zhiyuan Wei and Benjamin A. Stickler — Institute for Complex Quantum Systems, Ulm University

Levitating microscale magnetic particles above type-II superconductors through the Meissner effect [1,2] reduces heating and photon scattering associated with optical levitation and holds the promise to yield large mechanical quality factors. Here we present the equations of motion for a permanent magnet with arbitrary internal magnetization field interacting with its dynamic image and the flux-pinned fields formed in the superconductor. We show how the magnetic quadrupole moments of the particle can give rise to three-dimensional alignment via normal-modes analysis and numerical Hamiltonian simulations. We discuss implications for future experiments [3] probing the quantum dynamics of Meissner-levitated micromagnets.

[1] J. Gieseler, A. Kabcenell et al., Phys. Rev. Lett. 124, 163604 (2020).

[2] T. Wang, S. Lourette et al., Phys. Rev. Applied 11, 044041 (2019).

[3] P. Fadeev, T. Wang et al., Phys. Rev. D 103, 044056 (2021).

Keywords: Levitation; Magnetic; Trapping; Quadrupole; Superconductors