Microwave preparation of two-dimensional fermionic spin mixtures

Peaudecerf, B and Andia, M and Brown, M and Haller, E and Kuhr, S (2019) Microwave preparation of two-dimensional fermionic spin mixtures. New Journal of Physics, 21. 013020. ISSN 1367-2630

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    Abstract

    We present a method for preparing a single two-dimensional sample of a two-spin mixture of fermionic potassium in a single antinode of an optical lattice, in a quantum-gas microscope apparatus. Our technique relies on spatially-selective microwave transitions in a magnetic field gradient. Adiabatic transfer pulses were optimized for high efficiency and minimal atom loss and heating due to spin-changing collisions. We have measured the dynamics of those loss processes, which are more pronounced in the presence of a spin mixture. As the efficient preparation of atoms in a single antinode requires a homogeneous transverse magnetic field, we developed a method to image and minimize the magnetic field gradients in the focal plane of the microscope.