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On the Coulomb energy of a finite-temperature electron gas

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Abstract

We rederive the Coulomb expansion of the electron gas average energy at finite temperature, starting from scratch, i.e., using only the framework of the grand canonical ensemble and not the finite-T Green's function formalism. We recover the analytical expressions of the exchange and correlation energy in both the high-T and theT=0 limits. We explicitly show the origin of the crossover of the correlation energy leading term frome 4 lne 2 at zero temperature toe 3 at finiteT. We also discuss the relative importance of exchange and correlation in both limits.

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Betbeder-Matibet, O., Combescot, M. On the Coulomb energy of a finite-temperature electron gas. J Stat Phys 75, 953–969 (1994). https://doi.org/10.1007/BF02186752

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  • DOI: https://doi.org/10.1007/BF02186752

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