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Title: Exact thermal density functional theory for a model system: Correlation components and accuracy of the zero-temperature exchange-correlation approximation

Thermal density functional theory calculations often use the Mermin-Kohn-Sham scheme, but employ ground-state approximations to the exchange-correlation (XC) free energy. In the simplest solvable nontrivial model, an asymmetric Hubbard dimer, we calculate the exact many-body energies and the exact Mermin-Kohn-Sham functionals for this system and extract the exact XC free energy. For moderate temperatures and weak correlation, we find this approximation to be excellent. Here we extract various exact free-energy correlation components and the exact adiabatic connection formula.
Authors:
 [1] ;  [2] ;  [3]
  1. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
  3. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy; Univ. of California, Irvine, CA (United States). Dept. of Chemistry
Publication Date:
Report Number(s):
LLNL-JRNL-693045
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC52-07NA27344; FG02-97ER25308; DGE-1321846; FG02-08ER46496
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1389961
Alternate Identifier(s):
OSTI ID: 1257008