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Connecting Dissipation and Phase Slips in a Josephson Junction between Fermionic Superfluids
Physical Review Letters ( IF 8.6 ) Pub Date : 2018-01-12 00:00:00 , DOI: 10.1103/physrevlett.120.025302
A. Burchianti , F. Scazza , A. Amico , G. Valtolina , J. A. Seman , C. Fort , M. Zaccanti , M. Inguscio , G. Roati

We study the emergence of dissipation in an atomic Josephson junction between weakly coupled superfluid Fermi gases. We find that vortex-induced phase slippage is the dominant microscopic source of dissipation across the Bose-Einstein condensate–Bardeen-Cooper-Schrieffer crossover. We explore different dynamical regimes by tuning the bias chemical potential between the two superfluid reservoirs. For small excitations, we observe dissipation and phase coherence to coexist, with a resistive current followed by well-defined Josephson oscillations. We link the junction transport properties to the phase-slippage mechanism, finding that vortex nucleation is primarily responsible for the observed trends of conductance and critical current. For large excitations, we observe the irreversible loss of coherence between the two superfluids, and transport cannot be described only within an uncorrelated phase-slip picture. Our findings open new directions for investigating the interplay between dissipative and superfluid transport in strongly correlated Fermi systems, and general concepts in out-of-equilibrium quantum systems.

中文翻译:

费米离子超流体之间的约瑟夫森结中的耗散和相移的连接

我们研究了弱耦合超流体费米气体之间原子约瑟夫森结中耗散的出现。我们发现,涡流引起的相移是整个Bose-Einstein凝结物-Bardeen-Cooper-Schrieffer分流的主要微观耗散来源。我们通过调整两个超流体储层之间的偏化学势来探索不同的动力学机制。对于小激励,我们观察到耗散和相位相干共存,并伴随着电阻电流和明确定义的约瑟夫森振荡。我们将结传输特性与相移机制联系起来,发现涡旋形核主要负责观察到的电导和临界电流趋势。对于大的激发,我们观察到两个超流体之间不可逆的相干损失,传输只能在不相关的相移图片中描述。我们的发现为研究强相关费米系统中的耗散和超流体输运之间的相互作用以及非平衡量子系统中的一般概念开辟了新的方向。
更新日期:2018-01-12
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