Year: 2023
Type: article
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.
Source: Physical Review Letters
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, Matsuo Foundation for Science Promotion, Deutsche Forschungsgemeinschaft, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Japan Society for the Promotion of Science, H2020 European Research Council
Awards: G1763245312, Tailoring interactions in quantum matter, TRR 185: OSCAR Kontrolle atomarer und photonischer Quantenmaterie durch maßgeschneiderte Kopplung an Reservoire, G3031686616, Mass, heat and spin transport in interlinked quantum gases, SFB 1238: Kontrolle und Dynamik von Quantenmaterialien, Low dimensional quantum fluids, New developments in atomtronics, G6980798863, G7464644734, G7722004180, EXC 2004: Materie und Licht für Quanteninformation (ML4Q), Interplay between Topology, Interactions and Dissipation in Driven Quantum Many-Body Systems
OpenAlex ID: W4377092553