Velocity-dependent quantum phase slips in 1D atomic superfluids.
Velocity-dependent quantum phase slips in 1D atomic superfluids.
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速度依赖性量子相在1D原子超流体中。
DOI：
10.1038/srep25965
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发表时间：
2016-05-18
影响因子：
4.6
通讯作者：
D'Errico C
中科院分区：
文献类型：
--
作者：
Tanzi L;Scaffidi Abbate S;Cataldini F;Gori L;Lucioni E;Inguscio M;Modugno G;D'Errico C
量子相位滑移是一维超流体和低温超导体中的主要激发，但在超冷量子气体中的存在尚未得到证实。我们现在实验研究超冷量子气体沿沿着周期势流的一维超流体中相滑移的成核率。我们观察到一个政权的温度依赖性耗散在小的速度和相互作用和速度依赖性耗散在较大的速度和相互作用的第二个政权之间的交叉。这种行为与预测的从热辅助量子相位滑移到纯量子相位滑移的交叉一致。
Quantum phase slips are the primary excitations in one-dimensional superfluids and superconductors at low temperatures but their existence in ultracold quantum gases has not been demonstrated yet. We now study experimentally the nucleation rate of phase slips in one-dimensional superfluids realized with ultracold quantum gases, flowing along a periodic potential. We observe a crossover between a regime of temperature-dependent dissipation at small velocity and interaction and a second regime of velocity-dependent dissipation at larger velocity and interaction. This behavior is consistent with the predicted crossover from thermally-assisted quantum phase slips to purely quantum phase slips.