Probing the order parameter of strongly correlated fermionic superfluids from Josephson supercurrents

Seminario

20 febbraio 2020

Aula: Sala Riunioni - Ore: 15.00

Condividi su:

Programma

Introduce
Claudio Giannetti, Università Cattolica del Sacro Cuore
Interviene
Giacomo ROATI, LENS, Firenze

Abstract
I will present our recent observation of dc Josephson effect in BCS-BEC superfluid Fermi gases. In the absence of any applied chemical potential difference, we directly measure Josephson supercurrents that depend sinusoidally on the relative phase, in agreement with Josephson’s seminal prediction. We find quantitative agreement with a simple analytic model throughout the crossover region, enabling for the first time an explicit connection to the pair condensate density in strongly interacting Fermi gases. Our work demonstrates the effectiveness of coherent Josephson transport for pinning down superfluid order parameters, with great promise towards applications in diverse atomic systems, even with strong correlations.

Campus di Brescia