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Observation of collectivity enhanced magnetoassociation of $^6$Li in the quantum degenerate regime by Naniyil, Vineetha; Zhou, Yijia; Simmonds, Guy; Cooper, Nathan; Li, Weibin; Hackermüller, Lucia is a scholarly article available to read on EtoBox.

What is Observation of collectivity enhanced magnetoassociation of $^6$Li in the quantum degenerate regime about?

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 $^6$Li 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 cou

Author

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

Published

2021

Language

EN