Experimental Observation of Single- and Multi-Site Matter-Wave Solitons in 1D Optical Lattices

• URL: http://arxiv.org/abs/2504.11046v2
• Date: Mon, 28 Jul 2025 10:54:03 GMT
• Title: Experimental Observation of Single- and Multi-Site Matter-Wave Solitons in 1D Optical Lattices
• Authors: Robbie Cruickshank, Francesco Lorenzi, Arthur La Rooij, Ethan Kerr, Timon Hilker, Stefan Kuhr, Luca Salasnich, Elmar Haller,
• Abstract summary: We report the experimental observation of discrete bright matter-wave solitons with attractive interaction in an optical lattice.<n>Results reveal the existence and characteristics of these solitons across a range of lattice depths and spacings.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report the experimental observation of discrete bright matter-wave solitons with attractive interaction in an optical lattice. Using an accordion lattice with adjustable spacing, we prepare a Bose-Einstein condensate of cesium atoms across a defined number of lattice sites. By quenching the interaction strength and the trapping potential, we generate both single-site and multi-site solitons. Our results reveal the existence and characteristics of these solitons across a range of lattice depths and spacings. We identify stable regions of the solitons, based on interaction strength and lattice properties, and compare these findings with theoretical predictions. The experimental results qualitatively agree with a Gaussian variational model and match quantitatively with numerical simulations of the three-dimensional Gross-Pitaevskii equation, extended with a quintic term to account for the loss of atoms. Our results provide insights into the quench dynamics and collapse mechanisms, paving the way for further studies on transport and dynamical properties of matter-wave solitons in lattices.

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