Thermalization and Sub-Poissonian Density Fluctuations in a Degenerate Molecular Fermi Gas.,Physical Review Letters

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Thermalization and Sub-Poissonian Density Fluctuations in a Degenerate Molecular Fermi Gas.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-24 , DOI: 10.1103/physrevlett.124.033401
William G Tobias ₁ , Kyle Matsuda ₁ , Giacomo Valtolina ₁ , Luigi De Marco ₁ , Jun-Ru Li ₁ , Jun Ye ₁

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We observe thermalization in the production of a degenerate Fermi gas of polar ^{40}K^{87}Rb molecules. By measuring the atom-dimer elastic scattering cross section near the Feshbach resonance, we show that Feshbach molecules rapidly reach thermal equilibrium with both parent atomic species. Equilibrium is essentially maintained through coherent transfer to the ground state. Sub-Poissonian density fluctuations in Feshbach and ground-state molecules are measured, giving an independent characterization of degeneracy and directly probing the molecular Fermi-Dirac distribution.

中文翻译：

简并分子费米气体中的热化和亚泊松密度波动。

我们在极性^ {40} K ^ {87} Rb分子的简并费米气体的产生中观察到热化。通过测量接近Feshbach共振的原子二聚体弹性散射截面，我们显示Feshbach分子与两个母原子物种迅速达到热平衡。平衡基本上是通过相干转移到基态来维持的。测量了Feshbach和基态分子中的亚泊松密度波动，从而给出了简并性的独立表征，并直接探测分子Fermi-Dirac分布。

更新日期：2020-01-23

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