Trapping Fermionic ${}^{40}$K and Bosonic ${}^{87}$Rb on a Chip

Abstract

We demonstrate the loading of a Bose-Fermi mixture into a microfabricated magnetic trap. In a single-chamber vacuum system, laser-cooled atoms are transported to the surface of a substrate on which gold wires have been microfabricated. The magnetic field minimum formed near these current-carrying wires is used to confine up to $6\times 10^4$ neutral ${}^{40}$K atoms. In addition, we can simultaneously load $2\times 10^5$ ${}^{87}$Rb atoms, demonstrating the confinement of two distinct elements with such a trap. In a sequence optimized for ${}^{87}$Rb alone, we observe up to $1\times 10^7$ trapped atoms. We describe in detail the experimental apparatus, and discuss prospects for evaporative cooling towards quantum degeneracy in both species.

10 pages, 6 figures. To appear in Journal of Low Temperature Physics, Vol 140, Nos. 5/6, September 2005. (v4: proof corrections, references updated.)

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• Applications of exact solution for strongly interacting one dimensional bose-fermi mixture: low-temperature correlation functions, density profiles and collective modes
• Multi-particle composites in density-imbalanced quantum fluids
• Tapered-amplified AR-coated laser diodes for Potassium and Rubidium atomic-physics experiments
• Trapping Fermionic ${}^{40}$K and Bosonic ${}^{87}$Rb on a Chip
• Light-induced atomic desorption in a compact system for ultracold atoms
• Mixing-demixing transition in one-dimensional boson-fermion mixtures
• Fast production of ultracold sodium gases using light--induced desorption and optical trapping
• Light-Induced Atomic Desorption for loading a Sodium Magneto-Optical Trap
• Commissioning of the Francium Trapping Facility at TRIUMF
• Methods for Preparing Quantum Gases of Lithium
• Light-induced atomic desorption of lithium
• Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments
• Realization of BEC-BCS crossover physics in a compact oven-loaded magneto-optic trap apparatus
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• Efficient water-cooled Bitter-type electromagnet for Zeeman slowing in cold-atom experiments
• Exact solutions of a one-dimensional mixture of spinor bosons and spinor fermions