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Electrical manipulation of spin states in a single electrostatically gated transition-metal complex

Publication: Research - peer-reviewJournal article


Edgar A Osorio, Kasper Moth-Poulsen, Herre S J van der Zant, Jens Paaske, Per Hedegård, Karsten Flensberg, Jesper Bendix, Thomas Bjørnholm

We demonstrate an electrically controlled high-spin (S = 5/2) to low-spin (S = 1/2) transition in a three-terminal device incorporating a single Mn(2+) ion coordinated by two terpyridine ligands. By adjusting the gate-voltage we reduce the terpyridine moiety and thereby strengthen the ligand-field on the Mn-atom. Adding a single electron thus stabilizes the low-spin configuration and the corresponding sequential tunnelling current is suppressed by spin-blockade. From low-temperature inelastic cotunneling spectroscopy, we infer the magnetic excitation spectrum of the molecule and uncover also a strongly gate-dependent singlet-triplet splitting on the low-spin side. The measured bias-spectroscopy is shown to be consistent with an exact diagonalization of the Mn-complex, and an interpretation of the data is given in terms of a simplified effective model.
Original languageEnglish
JournalNano Letters
Issue number1
Pages (from-to)105-10
Number of pages6
StatePublished - 1 Jan 2010

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