The third law of thermodynamics and the degeneracy of the ground state for lattice systems

Michael Aizenman, Elliott H. Lieb

Research output: Contribution to journalArticle

75 Scopus citations

Abstract

The third law of thermodynamics, in the sense that the entropy per unit volume goes to zero as the temperature goes to zero, is investigated within the framework of statistical mechanics for quantum and classical lattice models. We present two main results: (i) For all models the question of whether the third law is satisfied can be decided completely in terms of ground-state degeneracies alone, provided these are computed for all possible "boundary conditions." In principle, there is no need to investigate possible entropy contributions from low-lying excited states, (ii) The third law is shown to hold for ferromagnetic models by an analysis of the ground states.

Original languageEnglish (US)
Pages (from-to)279-297
Number of pages19
JournalJournal of Statistical Physics
Volume24
Issue number1
DOIs
StatePublished - Jan 1981

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Mathematical Physics

Keywords

  • Third law
  • entropy
  • lattice systems
  • statistical mechanics
  • thermodynamics

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