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Observation of a bilayer superfluid with interlayer coherence.

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Titel: Observation of a bilayer superfluid with interlayer coherence.
Autoren: Rydow, Erik, Singh, Vijay Pal, Beregi, Abel, Chang, En, Mathey, Ludwig, Foot, Christopher J., Sunami, Shinichi
Quelle: Nature Communications; 8/5/2025, Vol. 16 Issue 1, p1-9, 9p
Schlagwörter: COHERENCE (Physics), JOSEPHSON effect, PHASE oscillations, MONTE Carlo method, BOSE-Einstein condensation, QUANTUM fluids, STATISTICAL correlation, VORTEX motion
Abstract: Controlling the coupling between different degrees of freedom in many-body systems is a powerful technique for engineering novel phases of matter. We create a bilayer system of two-dimensional (2D) ultracold Bose gases and demonstrate the controlled generation of bulk coherence through tunable interlayer Josephson coupling. We probe the resulting correlation properties of both phase modes of the bilayer system: the symmetric phase mode is studied via a noise-correlation method, while the antisymmetric phase fluctuations are directly captured by matter-wave interferometry. The measured correlation functions for both of these modes exhibit a crossover from short-range to quasi-long-range order above a coupling-dependent critical point, thus providing direct evidence of bilayer superfluidity mediated by interlayer coupling. We map out the phase diagram and interpret it with renormalization-group theory and Monte Carlo simulations. Additionally, we elucidate the underlying mechanism through the observation of suppressed vortex excitations in the antisymmetric mode. The authors report the implementation of a bilayer system of 2D ultracold Bose gases with controllable Josephson coupling. This allows characterisation of coupling-induced superfluid phases and their microscopic origin tracing back to vortex binding. [ABSTRACT FROM AUTHOR]
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Abstract:Controlling the coupling between different degrees of freedom in many-body systems is a powerful technique for engineering novel phases of matter. We create a bilayer system of two-dimensional (2D) ultracold Bose gases and demonstrate the controlled generation of bulk coherence through tunable interlayer Josephson coupling. We probe the resulting correlation properties of both phase modes of the bilayer system: the symmetric phase mode is studied via a noise-correlation method, while the antisymmetric phase fluctuations are directly captured by matter-wave interferometry. The measured correlation functions for both of these modes exhibit a crossover from short-range to quasi-long-range order above a coupling-dependent critical point, thus providing direct evidence of bilayer superfluidity mediated by interlayer coupling. We map out the phase diagram and interpret it with renormalization-group theory and Monte Carlo simulations. Additionally, we elucidate the underlying mechanism through the observation of suppressed vortex excitations in the antisymmetric mode. The authors report the implementation of a bilayer system of 2D ultracold Bose gases with controllable Josephson coupling. This allows characterisation of coupling-induced superfluid phases and their microscopic origin tracing back to vortex binding. [ABSTRACT FROM AUTHOR]
ISSN:20411723
DOI:10.1038/s41467-025-62277-w