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Observation of collectivity enhanced magnetoassociation of 6Li in the quantum degenerate regime

Naniyil, Vineetha; Zhou, Yijia; Simmonds, Guy; Cooper, Nathan; Li, Weibin; Hackermüller, Lucia


Vineetha Naniyil

Yijia Zhou

Guy Simmonds

Associate Professor

Lucia Hackermüller


The association process of Feshbach molecules is well described by a Landau-Zener (LZ) transition above the Fermi temperature, such that two-body physics dominates the dynamics. However, using 6Li atoms and the associated Feshbach resonance at B r = 834.1 G, we observe an enhancement of the atom-molecule coupling as the fermionic atoms reach degeneracy, demonstrating the importance of many-body coherence not captured by the conventional LZ model. In the experiment, we apply a linear association ramp ranging from adiabatic to non-equilibrium molecule association for various temperatures. We develop a theoretical model that explains the temperature dependence of the atom-molecule coupling. Furthermore, we characterize this dependence experimentally and extract the atom-molecule coupling coefficient as a function of temperature, finding qualitative agreement between our model and experimental results. In addition, we simulate the dynamics of molecular association during a nonlinear field ramp. We find that, in the non-equilibrium regime, molecular association efficiency can be enhanced by sweeping the magnetic field cubically with time. Accurate measurement of the atom-molecule coupling coefficient is important for both theoretical and experimental studies of molecular association and many-body collective dynamics.

Journal Article Type Article
Acceptance Date Oct 19, 2022
Online Publication Date Nov 3, 2022
Publication Date 2022-11
Deposit Date Dec 5, 2022
Publicly Available Date Dec 20, 2022
Journal New Journal of Physics
Electronic ISSN 1367-2630
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 24
Issue 11
Article Number 113005
Keywords General Physics and Astronomy
Public URL
Publisher URL


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