title: 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 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.
authors.affiliation: Institut für Theoretische Physik A, RWTH Aachen, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Romeike
authors.forename: M R
authors.initials: MR
authors.lastname: Wegewijs
authors.forename: H
authors.initials: H
authors.lastname: Schoeller