Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Q08: Ultracold Atomic Gas Mixtures
8:00 AM–10:00 AM,
Thursday, June 3, 2021
Chair: Sebastian Will, Columbia
Abstract: Q08.00003 : Ultracold 6Li-53Cr Fermi mixtures with tunable interactions*
8:24 AM–8:36 AM
Live
Presenter:
Alessio Ciamei
(Consiglio Nazionale delle Ricerche (CNR-INO))
Authors:
Alessio Ciamei
(Consiglio Nazionale delle Ricerche (CNR-INO))
Stefano Finelli
(University of Florence)
Massimo Inguscio
(CNR-INO and Campus Bio-Medico University of Rome)
Andreas Trenkwalder
(CNR-INO)
Matteo Zaccanti
(CNR-INO and LENS)
Collaborations:
Andrea Simoni (IPR - Institut de Physique de Rennes), Dmitry Petrov (LPTMS-Université Paris Sud)
Here, we report on our progress towards novel 6Li-53Cr degenerate Fermi mixtures. The peculiar mass ratio of our system uniquely enables the existence of resonant few-body cluster states with p-wave symmetry on the molecular side of an inter-species Feshbach resonance, together with an extraordinary suppression of three-body recombination processes at strong repulsion. These properties will allow us to resonantly tune elastic few-body p-wave interactions on top of the standard 2-body ones, as well as to overcome pairing instabilities in repulsive Fermi mixtures.
First, we will discuss our all-optical strategy to attain large ultracold samples of up to 106 Li and 3 105 Cr atoms at micro-Kelvin temperatures. Second, we will report on extensive Feshbach spectroscopy performed onto the six Li-Cr spin-mixtures of lowest energy. In particular, we identified more than 30 inter-species resonances, including four isolated features in the absolute mixture ground state, immune to two-body losses, and thereby promising for future many-body surveys.
[1] E. Neri et al., Phys. Rev. A 101, 063602 (2020)
[2] B. Bazak and D. S. Petrov, Phys. Rev. Lett. 118, 083002
[3] D. S. Petrov, Phys. Rev. A 67, 010703(R)
*This work was supported by the ERC through grant No. 637738 PoLiChroM, by the Italian MIUR through the FARE Grant No. R168HMHFYM, and by the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 894442.
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