General solution to the Kohn–Luttinger nonconvergence problem

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A simple, but general solution is proposed for the Kohn–Luttinger problem, i.e., the nonconvergence of the finite-temperature many-body perturbation theory with its zero-temperature counterpart as temperature is lowered to zero under some circumstances. How this nonconvergence can be avoided by altering the reference wave function is illustrated numerically by using up to the fifth order of the perturbation theory.

Original languageEnglish (US)
Article number139668
JournalChemical Physics Letters
StatePublished - Aug 2022


  • Free energy
  • Perturbation theory
  • Temperature
  • Thermodynamics

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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