A mixed dimensional Bose polaron

Abstract

A new generation of cold atom experiments trapping atomic mixtures in species selective optical potentials opens up the intriguing possibility to create systems in which different atoms live in different spatial dimensions. Inspired by this, we investigate a mixed dimensional Bose polaron consisting of an impurity particle moving in a two-dimensional (2D) layer immersed in a 3D Bose-Einstein condensate (BEC), using a theory that includes the mixed dimensional vacuum scattering between the impurity and the bosons exactly. We show that similarly to the pure 3D case, this system exhibits a well-defined polaron state for attractive boson-impurity interaction that evolves smoothly into a mixed-dimensional dimer for strong attraction, as well as a well-defined polaron state for weak repulsive interaction, which becomes over-damped for strong interaction. We furthermore find that the properties of the polaron depend only weakly on the gas parameter of the BEC as long as the Bogoliubov theory remains a valid description for the BEC. This indicates that higher order correlations between the impurity and the bosons are suppressed by the mixed dimensional geometry in comparison to a pure 3D system, and that the mixed dimensional polaron has universal properties in the unitarity limit of the impurity-boson interaction.

10 pages, 6 figures

References in corpus (14)

• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Attractive and repulsive Fermi polarons in two dimensions
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Species-specific optical lattices
• Excitation spectra and rf-response near the polaron-to-molecule transition from the functional renormalization group
• Scattering in Mixed Dimensions with Ultracold Gases
• Universal Fermi gases in mixed dimensions
• Ground state of a tightly bound composite dimer immersed in a Fermi Sea
• The Bose polaron problem: effect of mass imbalance on binding energy
• Polarons in Ultracold Fermi Superfluids
• Topological superfluid in a Fermi-Bose mixture with a high critical temperature
• Induced p-wave superfluidity in two dimensions: Brane world in cold atoms and nonrelativistic defect CFTs
• Topological transitions of gapless paired states in mixed-geometry lattices