Freiburg 2024 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

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 Schemmer^1,2, Stefano Finelli^1,2, Alessio Ciamei^1,2, Beatrice Restivo^1,2, Antonio Cosco^1,2, Andreas Trenkwalder^1,2, and Matteo Zaccanti^1,2 — 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.