Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-09-14
EPL 86, 27002 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 5 eps figures. Version published in EPL. Expanded from v1: Appendix added, references added, 1 figure added, others m
Scientific paper
10.1209/0295-5075/86/27002
We analyze the interference between tunneling paths that occurs for a spin system with both fourth-order and second-order transverse anisotropy. Using an instanton approach, we find that as the strength of the second-order transverse anisotropy is increased, the tunnel splitting is modulated, with zeros occurring periodically. This effect results from the interference of four tunneling paths connecting easy-axis spin orientations and occurs in the absence of any magnetic field.
Foss-Feig M. S.
Friedman Jonathan R.
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