期刊
SCIENCE
卷 370, 期 6521, 页码 1222-1226出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaz5756
关键词
-
资金
- National Science Foundation (Center for Ultracold Atoms) [PHY-1734011, PHY-1506019]
- U.S. Air Force Office of Scientific Research [FA9550-16-1-0324]
- U.S. Air Force Office of Scientific Research (MURI Quantum Phases of Matter) [FA9550-14-1-0035]
- U.S. Office of Naval Research [N00014-17-1-2257]
- David and Lucile Packard Foundation
- LabEX ENS-ICFP [ANR-10-LABX-0010/ANR-10-IDEX-0001-02 PSL*]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据