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DOI | 10.1126/science.aaz5756 |
Universal sound diffusion in a strongly interacting Fermi gas | |
Parth B. Patel; Zhenjie Yan; Biswaroop Mukherjee; Richard J. Fletcher; Julian Struck; Martin W. Zwierlein | |
2020-12-04 | |
发表期刊 | Science |
出版年 | 2020 |
英文摘要 | A gas of strongly interacting fermionic atoms can serve as a model for systems with densities and energies spanning many orders of magnitude. This universality of physics comes about thanks to a property known as scale invariance. Patel et al. exploited this concept to draw universal conclusions about the attenuation of sound in such systems by studying a homogeneous gas of lithium-6 atoms at very low temperatures (see the Perspective by Schaefer). They found that below the superfluid transition, the sound diffusivity behaved not unlike what has been observed in helium-4, a fluid of strongly interacting bosons. Science , this issue p. [1222][1]; see also p. [1162][2] Transport of strongly interacting fermions is crucial for the properties of modern materials, nuclear fission, the merging of neutron stars, and the expansion of the early Universe. Here, we observe a universal quantum limit of diffusivity in a homogeneous, strongly interacting atomic Fermi gas by studying sound propagation and its attenuation through the coupled transport of momentum and heat. In the normal state, the sound diffusivity D monotonically decreases upon lowering the temperature, in contrast to the diverging behavior of weakly interacting Fermi liquids. Below the superfluid transition temperature, D attains a universal value set by the ratio of Planck’s constant and the particle mass. Our findings inform theories of fermion transport, with relevance for hydrodynamic flow of electrons, neutrons, and quarks. [1]: /lookup/doi/10.1126/science.aaz5756 [2]: /lookup/doi/10.1126/science.abb6155 |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/305841 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Parth B. Patel,Zhenjie Yan,Biswaroop Mukherjee,et al. Universal sound diffusion in a strongly interacting Fermi gas[J]. Science,2020. |
APA | Parth B. Patel,Zhenjie Yan,Biswaroop Mukherjee,Richard J. Fletcher,Julian Struck,&Martin W. Zwierlein.(2020).Universal sound diffusion in a strongly interacting Fermi gas.Science. |
MLA | Parth B. Patel,et al."Universal sound diffusion in a strongly interacting Fermi gas".Science (2020). |
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