Oscillatory tunnel splittings in spin systems: A discrete wentzel-kramers-brillouin approach

Anupam Garg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Certain spin Hamiltonians that give rise to tunnel splittings that are viewed in terms of interfering instanton trajectories are restudied using a discrete WKB method, that is more elementary, and also yields wave functions and preexponential factors for the splittings. A novel turning point inside the classically forbidden region is analyzed, and a general formula is obtained for the splittings. The result is applied to the \Fe8 system. A previous result for the oscillation of the ground state splitting with external magnetic field is extended to higher levels.

Original languageEnglish (US)
Pages (from-to)4385-4388
Number of pages4
JournalPhysical review letters
Volume83
Issue number21
DOIs
StatePublished - Jan 1 1999

ASJC Scopus subject areas

  • General Physics and Astronomy

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