Persistent Currents in Rings of Ultracold Fermionic Atoms
Persistent Currents in Rings of Ultracold Fermionic Atoms
复制标题
超冷费米子原子环中的持续电流
DOI：
10.1103/physrevlett.128.150401
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发表时间：
2022
影响因子：
8.6
通讯作者：
Wright, Kevin C.
中科院分区：
文献类型：
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作者：
Cai, Yanping;Allman, Daniel G.;Sabharwal, Parth;Wright, Kevin C.
我们已经产生了被困在环中的超冷费米子原子的持续电流，在强相互作用状态下其寿命超过 10 秒。这些电流在足够低的温度下在 BCS 状态下保持稳定。我们通过改变相互作用强度将循环的 BCS 超流体驱动到正相并返回，发现量子化超流重新出现的概率对正相所花费的时间和最小相互作用强度非常不敏感。在我们的实验条件下排除自发电流形成后，我们认为超级流的再现是由于正常电流在此极限下的弱阻尼所致。这些结果表明，具有可调相互作用的超冷费米子原子可用于创建物质波电路，类似于之前用弱相互作用的玻色子原子创建的物质波电路。
We have produced persistent currents of ultracold fermionic atoms trapped in a ring, with lifetimes greater than 10 sec in the strongly interacting regime. These currents remain stable well into the BCS regime at sufficiently low temperature. We drive a circulating BCS superfluid into the normal phase and back by changing the interaction strength and find that the probability for quantized superflow to reappear is remarkably insensitive to the time spent in the normal phase and the minimum interaction strength. After ruling out spontaneous current formation for our experimental conditions, we argue that the reappearance of superflow is due to weak damping of normal currents in this limit. These results establish that ultracold fermionic atoms with tunable interactions can be used to create matter-wave circuits similar to those previously created with weakly interacting bosonic atoms.