Spin quantum tunneling in single molecular magnets: fingerprints in transport spectroscopy of current and noise

Details Spin quantum tunneling in single molecular magnets: fingerprints in transport spectroscopy of current and noise Spin quantum tunneling in single molecular magnets: fingerprints in transport spectroscopy of current and noise

2005-11-16

arxiv.org/abs/cond-mat/0511391v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.196805

We demonstrate that transport spectroscopy of single molecular magnets shows signatures of quantum tunneling at low temperatures. We find current and noise oscillations as function of bias voltage due to a weak violation of spin selection rules by quantum tunneling processes. The interplay with Boltzmann suppression factors leads to fake resonances with temperature-dependent position which do not correspond to any charge excitation energy. Furthermore, we find that quantum tunneling can completely suppress transport if the easy-plane anisotropy has a high symmetry.

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