Spin quantum tunneling in single molecular magnets: fingerprints in transport spectroscopy of current and noise |
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Authors: | Romeike C Wegewijs M R Schoeller H |
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Institution: | Institut für Theoretische Physik A, RWTH Aachen, Germany. |
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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 a 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 transverse anisotropy has a high symmetry. |
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