Realization of a quasi-two dimensional dipolar Bose gas

Lanthanide atoms with a large magnetic dipole moment, such as erbium and dysprosium, have attracted significant attention in quantum simulation benefitting from strong dipole-dipole interactions. Such long-ranged and anisotropic interaction gives rise to novel quantum states including quantum droplets and dipolar supersolids. However, while many predictions have been made on quasi-two dimensional dipolar Bose gases, such as anisotropic excitation spectrum and anisotropic coherence properties of superfluid, to date, experimental realization remains challenging. Here, we present the realization of quasi-two-dimensional dipolar Bose gas of erbium, where tight confinement is provided by an optical sheet trap and kinematically two-dimensional conditions are satisfied. To assess two-dimensional superfluidity arising from the Berezinsky-Kosterlitz-Thouless transition, we systematically monitor the momentum information of the sample by means of a momentum-focusing technique. Preliminary results will be discussed.