Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Fermionic Quantum Gases II (joint session Q/A)
Q 32.4: Vortrag
Mittwoch, 13. März 2024, 15:15–15:30, Aula
A quantum engine in the BEC-BCS crossover — •Jennifer Koch1, Keerthy Menon2, Eloisa Cuestas2,3, Sian Barbosa1, Eric Lutz4, Thomás Fogarty2, Thomas Busch2, and Artur Widera1 — 1Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Germany — 2OIST Graduate University, Onna, Japan — 3Enrique Gaviola Institute of Physics, Córdoba, Argentina — 4Institute for Theoretical Physics I, University of Stuttgart, Germany
Heat engines convert thermal energy into mechanical work both in the classical and quantum regimes. However, quantum theory offers genuine nonclassical forms of energy, different from heat, which so far have not been exploited in cyclic engines to produce useful work. In this talk, I will discuss a recently realized quantum many-body engine fuelled by the energy difference between fermionic and bosonic ensembles of ultracold particles that follows from the Pauli exclusion principle [1]. We employ a harmonically trapped superfluid gas of 6Li atoms close to a magnetic Feshbach resonance, which allows us to effectively change the quantum statistics from Bose-Einstein to Fermi-Dirac by tuning the gas between a Bose-Einstein condensate of bosonic molecules and a unitary Fermi gas (and back) through a magnetic field. The talk will focus on the quantum nature of such a Pauli engine. Additionally, I will present the pressure-volume diagram of the new kind of engine and show how the engine behaves after multiple cycles. Our findings establish quantum statistics as a useful thermodynamic resource for work production. [1] J. Koch et al., Nature 621, 723 (2023)
Keywords: engine; BEC-BCS crossover; nonequilibrium; quantum statistics; Pauli principle