SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 56: Quantum Gases: Fermions II

Q 56.8: Talk

Thursday, March 9, 2023, 16:15–16:30, F342

Thermometry for trapped fermionic atoms in the BCS limit — •Sejung Yong, Sian Barbosa, Jennifer Koch, Artur Widera, and Axel Pelster — Physics Department and Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Germany

Measuring the temperature of an interacting fermionic cloud of atoms in the BCS limit represents a delicate task. In the literature temperature measurements have so far been only suggested in an indirect way, where one sweeps isentropically from the BCS to the BEC limit. Instead we suggest here a direct thermometry, which relies on measuring the column density and comparing the obtained data with a Hartree-Fock-Bogoliubov mean-field theory combined with a local density approximation. In case of an attractive interaction between two-components of ⁶Li atoms trapped in a tri-axial harmonic confinement we show that minimizing the error within such an experiment-theory collaboration turns out to be a reasonable criterion for determining the temperature. The findings are discussed in view of various possible sources of errors.