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Superfluid Signatures in a Dissipative Quantum Point Contact
Meng-Zi Huang1, Jeffrey Mohan1, Anne-Maria Visuri2
1Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland.
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.
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