Superfluid signatures in a dissipative quantum point contact
Quantum Gases
2023-05-23 v2 Atomic Physics
Quantum Physics
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.
Cite
@article{arxiv.2210.03371,
title = {Superfluid signatures in a dissipative quantum point contact},
author = {Meng-Zi Huang and Jeffrey Mohan and Anne-Maria Visuri and Philipp Fabritius and Mohsen Talebi and Simon Wili and Shun Uchino and Thierry Giamarchi and Tilman Esslinger},
journal= {arXiv preprint arXiv:2210.03371},
year = {2023}
}
Comments
17 pages, 5 figures. Meng-Zi Huang and Jeffrey Mohan contributed equally to this work