Spin tunnelling in mesoscopic systems

Anupam Garg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We study spin tunnelling in molecular magnets as an instance of a mesoscopic phenomenon, with special emphasis on the molecule Fe8. We show that the tunnel splitting between various pairs of Zeeman levels in this molecule oscillates as a function of applied magnetic field, vanishing completely at special points in the space of magnetic fields, known as diabolical points. This phenomena is explained in terms of two approaches, one based on spin-coherent-state path integrals, and the other on a generalization of the phase integral (or WKB) method to difference equations. Explicit formulas for the diabolical points are obtained for a model Hamiltonian.

Original languageEnglish (US)
Pages (from-to)411-424
Number of pages14
JournalPramana - Journal of Physics
Volume56
Issue number2-3
DOIs
StatePublished - 2001

Keywords

  • Diabolical points
  • Discrete phase integral method
  • Spin path integrals
  • Spin tunnelling

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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