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arXiv · 2305.16320

Observation of the Fermionic Joule-Thomson Effect

Yunpeng Ji·Jianyi Chen·Grant L. Schumacher·Gabriel G. T. Assumpção·Songtao Huang·Franklin J. Vivanco·Nir Navon
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Abstract

We report the observation of the quantum Joule-Thomson (JT) effect in ideal and unitary Fermi gases. We study the temperature dynamics of these systems while they undergo an energy-per-particle conserving rarefaction. For scale-invariant systems, whose equations of state satisfy the relation $U\propto PV$, this rarefaction conserves the specific enthalpy, which makes it thermodynamically equivalent to a JT throttling process. We observe JT heating in an ideal Fermi gas, stronger at higher quantum degeneracy, a result of the repulsive quantum-statistical `force' arising from Pauli blocking. In a unitary Fermi gas, we observe that the JT heating is marginal in the temperature range $0.2 \lesssim T/T_{\mathrm{F}} \lesssim 0.8 $ as the repulsive quantum-statistical effect is lessened by the attractive interparticle interaction.

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Yunpeng Ji, Jianyi Chen, Grant L. Schumacher, Gabriel G. T. Assumpção, Songtao Huang, Franklin J. Vivanco, Nir Navon. 2023-05-25. Observation of the Fermionic Joule-Thomson Effect. https://doi.org/10.1103/physrevlett.132.153402

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