Critical velocity for superfluid flow across the BEC-BCS crossover.
Critical velocity for superfluid flow across the BEC-BCS crossover.
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DOI：
10.1103/physrevlett.99.070402
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发表时间：
2007-07
影响因子：
8.6
通讯作者：
David E. Miller;J. K. Chin;C. Stan;Yingmei Liu;W. Setiawan;C. Sanner;W. Ketterle
中科院分区：
文献类型：
--
作者：
David E. Miller;J. K. Chin;C. Stan;Yingmei Liu;W. Setiawan;C. Sanner;W. Ketterle
在BEC-BCS交叉过程中，观察到了超冷超流费米气体的临界速度。在单位点的临界速度的显著峰值表明，对于共振原子相互作用，超流是最稳健的。当运动的一维光学晶格的速度发生变化时，从耗散的突然开始确定了临界速度。研究了临界速度与晶格深度和非均匀密度分布的关系。
Critical velocities have been observed in an ultracold superfluid Fermi gas throughout the BEC-BCS crossover. A pronounced peak of the critical velocity at unitarity demonstrates that superfluidity is most robust for resonant atomic interactions. Critical velocities were determined from the abrupt onset of dissipation when the velocity of a moving one-dimensional optical lattice was varied. The dependence of the critical velocity on lattice depth and on the inhomogeneous density profile was studied.