~6Li超冷费米气体窄Feshbach共振的实验研究

Experimental Study on Narrow Feshbach Resonance in Ultracold Fermi Atoms of ~6Li

我们通过精确锁定Feshbach共振线圈中的电流,获得了稳定度接近10-5的Feshbach共振磁场。利用RF射频谱和原子共振损失谱精确地测量了超冷6 Li费米原子气体的窄Feshbach共振,研究了该Feshbach共振的相互作用和原子气体的能量依靠关系,测量了原子内态相互作用和密度所导致的射频跃迁的散射碰撞频移。这种能量依靠的相互作用的费米原子气体具有重要的意义,可以产生新奇的超流,用来模拟中子星物质的态方程。

We realized a magnetic field with a stability of 10-5 for Feshbach resonance by accurately stabilizing the current of the Feshbach coils.The narrow Feshbach resonance in ultracold Fermi atoms of -6Li was measured by the loss of atoms near the resonance region and radio-frequency spectroscopy.Then we explored the relationship between the interaction near this narrow Feshbach resonance and the energy of Fermi gases,as well as the frequency shift of RF transition resulted from the interaction of atomic internal states and the density of atoms.This Feshbach resonance can be applied to study strongly correlated Fermi systems with energy-dependent interactions,and it has a great significance for realizing exotic superfluids and monitoring the equation of state of neutron star.