scholarly journals Superfluid transition temperature in a Fermi gas with repulsion allowing for higher orders of perturbation theory

2000 ◽  
Vol 90 (5) ◽  
pp. 861-871 ◽  
Author(s):  
D. V. Efremov ◽  
M. S. Mar’enko ◽  
M. A. Baranov ◽  
M. Yu. Kagan
Keyword(s):  
Perturbation Theory ◽  
Transition Temperature ◽  
Fermi Gas ◽  
Superfluid Transition

scholarly journals Universal sound diffusion in a strongly interacting Fermi gas

Science ◽  
2020 ◽  
Vol 370 (6521) ◽  
pp. 1222-1226 ◽  
Author(s):  
Parth B. Patel ◽  
Zhenjie Yan ◽  
Biswaroop Mukherjee ◽  
Richard J. Fletcher ◽  
Julian Struck ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Sound Propagation ◽  
Fermi Gas ◽  
Nuclear Fission ◽  
Superfluid Transition ◽  
Quantum Limit ◽  
Fermi Liquids ◽  
Coupled Transport ◽  
Strongly Interacting ◽  
Universal Quantum

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.

scholarly journals Induced Interactions and the Superfluid Transition Temperature in a Three-Component Fermi Gas

2009 ◽  
Vol 103 (26) ◽  
Author(s):  
J.-P. Martikainen ◽  
J. J. Kinnunen ◽  
P. Törmä ◽  
C. J. Pethick
Keyword(s):  
Transition Temperature ◽  
Fermi Gas ◽  
Superfluid Transition
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