One-loop omega-potential of quantum fields with ellipsoid constant-energy surface dispersion law

P. O. Kazinski, M. A. Shipulya

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6 Citations (Scopus)


Rapidly convergent expansions of a one-loop contribution to the partition function of quantum fields with ellipsoid constant-energy surface dispersion law are derived. The omega-potential is naturally decomposed into three parts: the quasiclassical contribution, the contribution from the branch cut of the dispersion law, and the oscillating part. The low- and high-temperature expansions of the quasiclassical part are obtained. An explicit expression and a relation of the contribution from the cut with the Casimir term and vacuum energy are established. The oscillating part is represented in the form of the Chowla-Selberg expansion of the Epstein zeta function. Various resummations of this expansion are considered. The general procedure developed is then applied to two models: massless particles in a box both at zero and nonzero chemical potential, and electrons in a thin metal film. Rapidly convergent expansions of the partition function and average particle number are obtained for these models. In particular, the oscillations of the chemical potential of conduction electrons in graphene and a thin metal film due to a variation of size of the crystal are described.

Original languageEnglish
Pages (from-to)2658-2693
Number of pages36
JournalAnnals of Physics
Issue number10
Publication statusPublished - Oct 2011
Externally publishedYes



  • Casimir effect
  • Chemical potential oscillations
  • Chowla-Selberg expansion
  • High-temperature expansion

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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