Tunneling transport of atomic Fermi gases across the superfluid phase transition

Year: 2022

Authors: Del Pace Giulia

Autors Affiliation: INO-CNR and LENS – 50019 Sesto Fiorentino, Italy

Abstract: In this article, I review on two recent experiments on tunneling transport of atomic Fermi superfluids. By injecting controlled currents in a two-reservoir system coupled through a thin barrier, Josephson critical currents are directly accessed and employed to extract the condensed fraction of strongly interacting fermionic superfluids. At finite temperature, Josephson supercurrents are observed to breakdown when approaching the critical temperature of the superfluid phase transition, thus demonstrating them as a reliable probe of condensation at any temperature. Furthermore, the study of resistive currents reveals the importance of Bogoliubov-Anderson sound modes in the conduction of a unitary gas, increased by the phonon-condensate coupling at low temperature. These works highlight how transport measurements can unveil both the coherence properties and the role of excitations in quantum matter.


Volume: 45 (6)      Pages from: 167-1  to: 167-4

More Information: The author acknowledges all the members of the experimental team of Giacomo Roati, who have contributed to the described works, in particular Francesco Scazza, Woo Jin Kwon, Riccardo Panza and Massimo Inguscio, and Matteo Zaccanti and Wilhelm Zwerger for the theory support. This work was supported by ERC GA no. 307032 QuFerm2D and no. 637738 PoLiChroM, Fondazione Cassa di Risparmio di Firenze project QuSim2D 2016.0770, the Italian MIUR PRIN2017 project CEnTraL, EU´s Horizon 2020 research and innovation program under the Qombs project FET Flagship on Quantum Technologies GA No. 820419, and under the MSC actions GAs no. 705269 and no. 843303.
KeyWords: Fermi gases
DOI: 10.1393/ncc/i2022-22167-7