Application of the discrete Wentzel-Kramers-Brillouin method to spin tunneling

Abstract

A discrete version of the WKB method is developed and applied to calculate the tunnel splittings between classically degenerate states of spin Hamiltonians. The results for particular model problems are in complete accord with those previously found using instanton methods. The discrete WKB method is more elementary and also yields wavefunctions.

RevTex, 2ps figures, incorporates errata (typos and omitted reference) in JMP paper

References in corpus (1)

• Instanton picture of the spin tunneling in the Lipkin model

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