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Connecting Dissipation and Phase Slips in a Josephson Junction between Fermionic Superfluids

  Articoli su Riviste JCR/ISI  (anno 2018)

Autori:  Burchianti A., Scazza F., Amico A., Valtolina G., Seman J.A, Fort C., Zaccanti M., Inguscio M., Roati G

Affiliazione Autori:  Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche (INO-CNR), 50019 Sesto Fiorentino, Italy; LENS and Dipartimento di Fisica e Astronomia, UniversitÓ di Firenze, 50019 Sesto Fiorentino, Italy; Instituto de Fisica, Universidad Nacional Autˇnoma de M exico, 01000 Ciudad de Mexico, Mexico

Riassunto:  We study the emergence of dissipation in an atomic Josephson junction between weakly coupled superfluid Fermi gases. We find that vortex-induced phase slippage is the dominant microscopic source of dissipation across the Bose-Einstein condensate-Bardeen-Cooper-Schrieffer crossover. We explore different dynamical regimes by tuning the bias chemical potential between the two superfluid reservoirs. For small excitations, we observe dissipation and phase coherence to coexist, with a resistive current followed by well-defined Josephson oscillations. We link the junction transport properties to the phase-slippage mechanism, finding that vortex nucleation is primarily responsible for the observed trends of conductance and critical current. For large excitations, we observe the irreversible loss of coherence between the two superfluids, and transport cannot be described only within an uncorrelated phase-slip picture. Our findings open new directions for investigating the interplay between dissipative and superfluid transport in strongly correlated Fermi systems, and general concepts in out-of-equilibrium quantum systems.

Volume n.:  120 (2)      Pagine da: 025302  a: 025302
Ulteriori informazioni:  We acknowledge inspiring discussions with F. Dalfovo, T. Giamarchi, F. Piazza, N. Proukakis, A. Smerzi, A. Trombettoni, and K. Xhani. We especially acknowledge the LENS Quantum Gases group. This work was supported by the ERC through Grant No. 307032 QuFerm2D and by the Marie Sklodowska-Curie programme (Grant No. 705269 to F.S.). J.A.S. acknowledges supporting grants from Universidad Nacional Autonoma de Mexico-Direccion General de Asuntos del Personal Academico/Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica IA101716 and Consejo Nacional de Ciencia y Tecnologia (CONACyT) LN-271322.
DOI: 10.1103/PhysRevLett.120.025302

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