Resistive Flow in a Weakly Interacting Bose-Einstein Condensate
Resistive Flow in a Weakly Interacting Bose-Einstein Condensate
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DOI：
10.1103/physrevlett.113.045305
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发表时间：
2014-07-25
影响因子：
8.6
通讯作者：
Campbell, G. K.
中科院分区：
文献类型：
--
作者：
Jendrzejewski, F.;Eckel, S.;Campbell, G. K.
本文报道了在弱相互作用原子玻色-爱因斯坦凝聚体中通过弱连接的电阻流的直接观测结果。两个薄弱环节将我们的环形超流体原子电子电路分成两个不同的区域，一个源极和一个漏极。这些薄弱环节的运动允许在源极和漏极之间产生受控的流动。在弱连接速度的临界值，我们观察到从超流流的超流加阻力流的过渡。在流体力学极限下工作，我们观察到的电导率是4个数量级大于以前报道的电导率的玻色-爱因斯坦凝聚体与隧道结。与零温度Gross-Pitaevskii模拟和基于相位滑移的唯象模型的良好一致性表明，激发的产生在所产生的导电性中起着重要的作用。我们的电阻流测量阐明了耗散的微观起源，并为更复杂的原子电子器件铺平了道路。
We report the direct observation of resistive flow through a weak link in a weakly interacting atomic Bose-Einstein condensate. Two weak links separate our ring-shaped superfluid atomtronic circuit into two distinct regions, a source and a drain. Motion of these weak links allows for creation of controlled flow between the source and the drain. At a critical value of the weak link velocity, we observe a transition from superfluid flow to superfluid plus resistive flow. Working in the hydrodynamic limit, we observe a conductivity that is 4 orders of magnitude larger than previously reported conductivities for a Bose-Einstein condensate with a tunnel junction. Good agreement with zero-temperature Gross-Pitaevskii simulations and a phenomenological model based on phase slips indicate that the creation of excitations plays an important role in the resulting conductivity. Our measurements of resistive flow elucidate the microscopic origin of the dissipation and pave the way for more complex atomtronic devices.