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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster – Ultra-cold atoms, ions and BEC (joint session A/Q)
Q 64.12: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 1. OG
Fano-suppression of losses in scattering resonances of bosonic erbium — •Arfor Houwman1, Louis Lafforgue2, Sarah Embacher1, Manfred Mark1,2, and Francesca Ferlaino1,2 — 1Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften — 2Universität Innsbruck, Institut für Experimentalphysik, 6020 Innsbruck, Austria
Lanthanides exhibit remarkable complexity in their scattering properties due to their numerous valence electrons which is reflected in the exceptionally dense Feshbach spectrum in the ground state. Here we explore the situation of bosonic spin mixtures of erbium, adding the additional spin degree to the problem. We observe inter- and intra-spin scattering resonances exhibiting a peculiar Fano shape with a pronounced loss minimum, indicating a destructive interference phenomenon. Our multi-channel model captures the essential behaviour and additionally predicts a series of Fano-Feshbach resonances across multiple spin compositions connected to the same molecular state. We observe this series and find good agreement to our model. Our work opens the door for a detailed investigation to study multi-spin strongly-coupled scattering phenomena.
Keywords: Dipolar Quantum Gas; Feshbach Resonance; Quantum Interference; Spin Physics