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

Abstract

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.

arXiv comment4 pages, 3 figures

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• The single-electron transport in a three-ion magnetic molecule modulated by a transverse field
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• Negative differential conductance and super-Poissonian shot noise in single-molecule magnet junctions