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arXiv · 2210.03371

Superfluid signatures in a dissipative quantum point contact

Meng-Zi Huang·Jeffrey Mohan·Anne-Maria Visuri·Philipp Fabritius·Mohsen Talebi·Simon Wili·Shun Uchino·Thierry Giamarchi·Tilman Esslinger
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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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Meng-Zi Huang, Jeffrey Mohan, Anne-Maria Visuri, Philipp Fabritius, Mohsen Talebi, Simon Wili, Shun Uchino, Thierry Giamarchi, Tilman Esslinger. 2022-10-07. Superfluid signatures in a dissipative quantum point contact. https://doi.org/10.1103/physrevlett.130.200404

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