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Josephson effect in fermionic superfluids across the BEC-BCS crossover.

Giacomo Valtolina¹, Alessia Burchianti², Andrea Amico³

¹Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche (CNR), 50019 Sesto Fiorentino, Italy. European Laboratory for Nonlinear Spectroscopy (LENS), 50019 Sesto Fiorentino, Italy. Faculty of Mathematic and Natural Sciences, Scuola Normale Superiore, 56126 Pisa, Italy.

Science (New York, N.Y.)

|December 19, 2015

Summary

This summary is machine-generated.

Researchers observed the Josephson effect in fermionic superfluids, demonstrating a quantum phenomenon linking molecular Bose-Einstein condensates and Bardeen-Cooper-Schrieffer superfluids. This reveals key insights into superfluid dynamics and broken symmetry.

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Spatial Separation of Molecular Conformers and Clusters

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Published on: January 9, 2014

Area of Science:

Quantum physics
Condensed matter physics
Superfluidity

Background:

The Josephson effect is a macroscopic quantum phenomenon crucial for understanding superfluid states and their broken symmetry.
Fermionic superfluids exhibit complex behaviors, particularly in the crossover between different superfluid regimes.

Purpose of the Study:

To observe and analyze the Josephson effect between two coupled fermionic superfluids.
To investigate the relationship between relative population and phase in fermionic superfluids across the BEC-BCS crossover.
To explore the dissipative dynamics and vortex propagation in these systems.

Main Methods:

Coupling two fermionic superfluids via a thin tunneling barrier.
Inducing initial excitations from equilibrium to observe dynamic responses.
Analyzing the system's behavior throughout the molecular Bose-Einstein condensate (BEC) to Bardeen-Cooper-Schrieffer (BCS) superfluid regime crossover.

Main Results:

Successfully observed the Josephson effect between two fermionic superfluids.
Demonstrated that relative population and phase are canonically conjugate variables.
Observed dissipative dynamics attributed to vortex propagation for larger excitations.

Conclusions:

The study confirms the Josephson effect in fermionic superfluids, highlighting the robustness of resonant superfluids.
The findings provide a deeper understanding of quantum phenomena in superfluid systems.
Results offer insights into the fundamental properties of superfluids across different regimes.