SU(2) instantons with boundary jumps and spin tunneling in magnetic molecules

Details SU(2) instantons with boundary jumps and spin tunneling in magnetic molecules SU(2) instantons with boundary jumps and spin tunneling in magnetic molecules

2001-11-08

arxiv.org/abs/cond-mat/0111143v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, revtex4 format, 3 embedded eps figures

Scientific paper

10.1103/PhysRevLett.88.237205

Coherent state path integrals are shown in general to contain instantons with jumps at the boundaries, i.e., with boundary points lying outside classical parameter or phase space. As an example, the magnetic molecule Fe_8 is studied using a realistic Hamiltonian, and instanons with jumps are shown to dominate beyond a certain external magnetic field. An approximate formula is found for the fields where ground state tunneling is quenched in this molecule.

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