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Superfluid signatures in a dissipative quantum point contact

Authors :
Huang, Meng-Zi
Mohan, Jeffrey
Visuri, Anne-Maria
Fabritius, Philipp
Talebi, Mohsen
Wili, Simon
Uchino, Shun
Giamarchi, Thierry
Esslinger, Tilman
Source :
Phys. Rev. Lett. 130, 200404 (2023)
Publication Year :
2022

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.<br />Comment: 17 pages, 5 figures. Meng-Zi Huang and Jeffrey Mohan contributed equally to this work

Details

Database :
arXiv
Journal :
Phys. Rev. Lett. 130, 200404 (2023)
Publication Type :
Report
Accession number :
edsarx.2210.03371
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevLett.130.200404