Mainz 2026 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 9: Ultracold Matter III – Fermions (joint session Q/A)

A 9.3: Vortrag

Dienstag, 3. März 2026, 11:30–11:45, P 2

Quantum engine and thermometry in the BEC-BCS crossover — •Felix Lang, Alexander Guthmann, Louisa Kinesberger, Eleonora Lippi, and Artur Widera — RPTU University Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

Heat engines have become an integral part of our lives, as they allow us to turn heat into physical work. Quantum heat engines can run at higher efficiencies than their classical counterparts [1]. Our platform uses ultracold quantum gases of ⁶Li in a harmonic trap along the crossover from a Bardeen-Cooper-Schrieffer (BCS) superfluid to a Bose-Einstein condensate (BEC) allowing us to utilize quantum statistics of fermions and bosons to perform work in a thermodynamic engine cycle.

In this talk, we present experimental results on the engine’s efficiency over a large parameter space spanned by temperature and interaction strength. A key component of our analysis is thermometry based on the virial expansion of the Fermi gas. Our results demonstrate a versatile route toward exploring quantum thermodynamics in strongly interacting many-body Fermi systems.

[1] Koch, J. et al. A quantum engine in the BEC-BCS crossover. Nature 621, 723-727 (2023)

Keywords: quantum engine; BEC-BCS crossover; superfluid; thermometry; virial expansion