Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 25: Poster IV
A 25.4: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent A
Ultracold LiCr Feshbach dimers: prospects for doubly-polar ground-state molecules — •Maximilian Schemmer1,2, Stefano Finelli1,2, Alessio Ciamei1,2, Beatrice Restivo1,2, Antonio Cosco1,2, Andreas Trenkwalder1,2, and Matteo Zaccanti1,2 — 1Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche (CNR-INO), 50019 Sesto Fiorentino, Italy — 2European Laboratory for Nonlinear Spectroscopy (LENS), 50019 Sesto Fiorentino, Italy
We report the creation and study of ultracold 6Li53Cr Feshbach molecules. Leveraging on the Fermi statistics of the parent atomic mixture, we adiabatically associate up to 50×103 LiCr at a peak phase-space density of about 0.1, thereby populating a weakly-bound rotationless level of the electronic ground-state 6Σ+. We directly observe the paramagnetic nature of 6Σ+ by measuring the magnetic dipole moment of closed-channel dimers, and we show precise control of the open-channel fraction close to the Feshbach resonance pole. We characterize the loss mechanisms induced by trap light and inelastic collisions. We show that a pure molecule sample trapped at a convenient wavelength of 1560nm features lifetimes exceeding 0.2 s. According to recent ab-initio calculations, efficient and coherent transfer to the absolute ground-state will deliver doubly-polar molecules for novel quantum simulation and computation as well as ultracold chemistry.
Keywords: Ultracold molecules; Fermi-Fermi mixture