Superfluid signatures in a dissipative quantum point contact

Abstract

We measure superfluid transport of strongly interacting fermionic lithium atoms through a quantum point contact with local, spin-dependent particle loss. We observe that the characteristic non-Ohmic superfluid transport enabled by high-order multiple Andreev reflections transitions into an excess Ohmic current as the dissipation strength exceeds the superfluid gap. We develop a model with mean-field reservoirs connected via tunneling to a dissipative site. Our calculations in the Keldysh formalism reproduce the observed nonequilibrium particle current, yet do not fully explain the observed loss rate or spin current.

17 pages, 5 figures. Meng-Zi Huang and Jeffrey Mohan contributed equally to this work

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• Spin-Depairing-Induced Exceptional Fermionic Superfluidity
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• Slave-spin approach to the Anderson-Josephson quantum dot