三组分简并费米气体的碰撞稳定性
Collisional stability of a three-component degenerate Fermi gas
摘要：
我们报告的创建简并费米气体组成的平衡混合物的原子在三个不同的超精细态的$^6$锂。这个新系统由三个可区分的费米子组成，它们具有不同的和可调的粒子间散射长度$a_{12}$，$a_{13}$和$a_{23}$。我们能够在约$215 $ nK的温度下制备含有处于每种状态的$5 \cdot 10^4$原子的样品，其对应于$T/T_F \approx 0.37$。我们研究了气体在0 ~ 600 G的磁场下的碰撞稳定性，发现在130 G时有一个显著的损耗特征。从寿命的测量，我们确定了三体损失系数，这在近三个数量级的变化。
英文摘要：
We report on the creation of a degenerate Fermi gas consisting of a balanced mixture of atoms in three different hyperfine states of $^6$Li. This new system consists of three distinguishable Fermions with different and tunable interparticle scattering lengths $a_{12}$, $a_{13}$ and $a_{23}$. We are able to prepare samples containing $5 \cdot 10^4$ atoms in each state at a temperature of about $215 $nK, which corresponds to $T/T_F \approx 0.37$. We investigated the collisional stability of the gas for magnetic fields between 0 and 600 G and found a prominent loss feature at 130 G. From lifetime measurements we determined three-body loss coefficients, which vary over nearly three orders of magnitude.
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