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Towards the experimental realization of a strongly interacting 1D Fermi gas

Abstract : This thesis reports on the recent results of the FerMix experiment, which is dedicated to the study of fermionic quantum many-body systems at ultralow temperatures using ensemble of ⁴⁰K. The main achievements are twofold. First, we describe the experimental apparatus and the successive stages leading to the preparation of a deeply degenerate Fermi gas of 1.5×10⁴ atoms of ⁴⁰K at a temperature of T/TF = 0.14, just below the critical temperature of superfluidity. Second, we summarize our progress towards the exploration of the dimensional crossover between the Tomonaga- Luttinger liquid in 1D and the Landau-Fermi liquid in 3D. To that end, we confine our ultracold Fermi gas in a large spacing optical lattice. The experimental considerations regarding the tunability of the dimensionality of our system as well as the apparatus used to generate the 2D lattice are described in detail. Following the characterization of the optical periodic potential, the strategy employed to transfer atoms into a single 1D lattice before loading them into the 2D standing wave is discussed. The loading of the 1D lattice represents the final milestone presented in this work: the realization of a degenerate Fermi gas in two dimensions composed of 250 atoms per spin state at a temperature T/TF = 0.34.
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Submitted on : Tuesday, November 30, 2021 - 9:45:12 AM
Last modification on : Wednesday, January 12, 2022 - 10:29:24 AM

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  • HAL Id : tel-03456480, version 1

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Cédric Enesa. Towards the experimental realization of a strongly interacting 1D Fermi gas. Quantum Gases [cond-mat.quant-gas]. Université Paris sciences et lettres, 2019. English. ⟨NNT : 2019PSLEE084⟩. ⟨tel-03456480⟩

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