Eckel S, Lee Jeffrey G, Jendrzejewski F, Lobb C J, Campbell G K, Hill W T
Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA.
Phys Rev A (Coll Park). 2016 Jun;93(6). doi: 10.1103/PhysRevA.93.063619.
We have experimentally measured transport of superfluid, bosonic atoms in a mesoscopic system: a small channel connecting two large reservoirs. Starting far from equilibrium (superfluid in a single reservoir), we observe first resistive flow transitioning at a critical current into superflow, characterized by oscillations. We reproduce this full evolution with a simple electronic circuit model. We compare our fitted conductance to two different microscopic phenomenological models. We also show that the oscillations are consistent with LC oscillations as estimated by the kinetic inductance and effective capacitance in our system. Our experiment provides an attractive platform to begin to probe the mesoscopic transport properties of a dilute, superfluid, Bose gas.
一个连接两个大储液器的小通道。从远离平衡态开始（单个储液器中的超流体），我们观察到在临界电流下，首先是有电阻的流动转变为超流，其特征为振荡。我们用一个简单的电子电路模型重现了这一完整的演化过程。我们将拟合的电导与两种不同的微观唯象模型进行了比较。我们还表明，这些振荡与通过我们系统中的动电感和有效电容估算出的LC振荡一致。我们的实验提供了一个有吸引力的平台，可用于开始探究稀薄超流玻色气体的介观输运性质。
