Spin coherent-state path integrals and the instanton calculus

Anupam Garg, Evgueny Kochetov, Kee Su Park, Michael Stone

Research output: Contribution to journalArticlepeer-review


We use an instanton approximation to the continuous-time spin coherent-state path integral to obtain the tunnel splitting of classically degenerate ground states. We show that provided the fluctuation determinant is carefully evaluated, the path integral expression is accurate to order O(1/j). We apply the method to the LMG model and to the molecular magnet Fe8 in a transverse field.

Original languageEnglish (US)
Pages (from-to)48-70
Number of pages23
JournalJournal of Mathematical Physics
Issue number1
StatePublished - Jan 1 2003

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics


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