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Quantum Simulation

Superfluid Fraction of a 2D Bose-Einstein Condensate in a Triangular Lattice

arXiv
Authors: F. Rabec, G. Brochier, S. Wattellier, G. Chauveau, Y. Li, S. Nascimbene, J. Dalibard, J. Beugnon

Year

2025

Paper ID

17522

Status

Preprint

Abstract Read

~2 min

Abstract Words

104

Citations

N/A

Abstract

We experimentally investigate the superfluid properties of a two-dimensional, weakly interacting Bose-Einstein condensate in the zero-temperature regime, when it is subjected to a triangular optical lattice potential. We implement an original method, which involves solving the hydrodynamic continuity equation to extract the superfluid fraction tensor from the measured in situ density distribution of the fluid at rest. In parallel, we apply an independent dynamical approach that combines compressibility and sound velocity measurements to determine the superfluid fraction. Both methods yield consistent results in good agreement with simulations of the Gross-Pitaevskii equation as well as with the Leggett bounds determined from the measured density profiles.

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  • We experimentally investigate the superfluid properties of a two-dimensional, weakly interacting Bose-Einstein condensate in the zero-temperature regime, when it is subjected...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2511.04575 [2] arXiv https://arxiv.org/abs/2511.04575 [3] Publisher https://arxiv.org/abs/2511.04575

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