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arXiv · 1408.4680

Matter wave Fourier optics with a strongly interacting two-dimensional Fermi gas

P. A. Murthy·D. Kedar·T. Lompe·M. Neidig·M. G. Ries·A. N. Wenz·G. Zürn·S. Jochim
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Abstract

We demonstrate and characterize an experimental technique to directly image the momentum distribution of a strongly interacting two-dimensional quantum gas with high momentum resolution. We apply the principles of Fourier optics to investigate three main operations on the expanding gas: focusing, collimation and magnification. We focus the gas in the radial plane using a harmonic confining potential and thus gain access to the momentum distribution. We pulse a different harmonic potential to stop the rapid axial expansion which allows us to image the momentum distribution with high resolution. Additionally, we propose a method to magnify the mapped momentum distribution to access interesting momentum scales. All these techniques can be applied to a wide range of experiments and in particular to study many-body phases of quantum gases.

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P. A. Murthy, D. Kedar, T. Lompe, M. Neidig, M. G. Ries, A. N. Wenz, G. Zürn, S. Jochim. 2014-08-20. Matter wave Fourier optics with a strongly interacting two-dimensional Fermi gas. https://doi.org/10.1103/physreva.90.043611

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