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Title: Breakdown of Fermi Degeneracy in the Simplest Liquid Metal

We are reporting the observation of the breakdown of electrons’ degeneracy and emergence of classical statistics in the simplest element: metallic deuterium. We have studied the optical reflectance, shock velocity and temperature of dynamically compressed liquid deuterium up to its Fermi temperature, TF. Above the insulator–metal transition, the optical reflectance shows the distinctive temperature-independent resistivity saturation, which is prescribed by the Mott-Ioffe-Regel minimum metallic limit, in agreement with previous experiments. At T > 0.4 T F, however, the reflectance of metallic deuterium starts to rise with a temperature-dependent slope, consistent with the breakdown of the Fermi surface. The experimentally inferred collisional time in this region exhibits the characteristic temperature dependence expected for a classical Landau-Spitzer plasma. Our observation of electron degeneracy lifting extends studies of degeneracy to new fermionic species, electron Fermi systems and offers an invaluable benchmark for quantum statistical models of Coulomb systems over a wide range of temperatures relevant to dense astrophysical objects and ignition physics.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics, Dept. of Mechanical Engineering, and Physics and Astronomy
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
2018-221,1480
Journal ID: ISSN 0031-9007; PRLTAO; 2018-221, 1480, 2439
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1502463
Alternate Identifier(s):
OSTI ID: 1496909

Zaghoo, M., Boehly, T. R., Rygg, J. R., Celliers, P. M., Hu, S. X., and Collins, G. W.. Breakdown of Fermi Degeneracy in the Simplest Liquid Metal. United States: N. p., Web. doi:10.1103/PhysRevLett.122.085001.
Zaghoo, M., Boehly, T. R., Rygg, J. R., Celliers, P. M., Hu, S. X., & Collins, G. W.. Breakdown of Fermi Degeneracy in the Simplest Liquid Metal. United States. doi:10.1103/PhysRevLett.122.085001.
Zaghoo, M., Boehly, T. R., Rygg, J. R., Celliers, P. M., Hu, S. X., and Collins, G. W.. 2019. "Breakdown of Fermi Degeneracy in the Simplest Liquid Metal". United States. doi:10.1103/PhysRevLett.122.085001.
@article{osti_1502463,
title = {Breakdown of Fermi Degeneracy in the Simplest Liquid Metal},
author = {Zaghoo, M. and Boehly, T. R. and Rygg, J. R. and Celliers, P. M. and Hu, S. X. and Collins, G. W.},
abstractNote = {We are reporting the observation of the breakdown of electrons’ degeneracy and emergence of classical statistics in the simplest element: metallic deuterium. We have studied the optical reflectance, shock velocity and temperature of dynamically compressed liquid deuterium up to its Fermi temperature, TF. Above the insulator–metal transition, the optical reflectance shows the distinctive temperature-independent resistivity saturation, which is prescribed by the Mott-Ioffe-Regel minimum metallic limit, in agreement with previous experiments. At T > 0.4 TF, however, the reflectance of metallic deuterium starts to rise with a temperature-dependent slope, consistent with the breakdown of the Fermi surface. The experimentally inferred collisional time in this region exhibits the characteristic temperature dependence expected for a classical Landau-Spitzer plasma. Our observation of electron degeneracy lifting extends studies of degeneracy to new fermionic species, electron Fermi systems and offers an invaluable benchmark for quantum statistical models of Coulomb systems over a wide range of temperatures relevant to dense astrophysical objects and ignition physics.},
doi = {10.1103/PhysRevLett.122.085001},
journal = {Physical Review Letters},
number = 8,
volume = 122,
place = {United States},
year = {2019},
month = {2}
}

Works referenced in this record:

Ground State of the Electron Gas by a Stochastic Method
journal, August 1980