Loading and compression of a single two-dimensional Bose gas in an optical accordion

Abstract

The experimental realization of 2D Bose gases with a tunable interaction strength is an important challenge for the study of ultracold quantum matter. Here we report on the realization of an optical accordion creating a lattice potential with a spacing that can be dynamically tuned between 11$\mu$m and 2$\mu$m. We show that we can load ultracold ${}^{87}$Rb atoms into a single node of this optical lattice in the large spacing configuration and then decrease nearly adiabatically the spacing to reach a strong harmonic confinement with frequencies larger than ${\omega }_z/2\pi =10$kHz. Atoms are trapped in an additional flat-bottom in-plane potential that is shaped with a high resolution. By combining these tools we create custom-shaped uniform 2D Bose gases with tunable confinement along the transverse direction and hence with a tunable interaction strength.

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• Artificial gauge potentials for neutral atoms
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• A two-dimensional quantum gas in a magnetic trap
• Real-time control of the periodicity of a standing wave: an optical accordion
• Phase separation and pair condensation in a spin-imbalanced 2D Fermi gas
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• Ultracold atoms in an optical lattice with dynamically variable periodicity
• Hybrid 2D surface trap for quantum simulation
• All-optical transport and compression of ytterbium atoms into the surface of a solid immersion lens

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