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

نویسندگان

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

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.

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عنوان ژورنال:
  • Nano letters

دوره 10 1  شماره 

صفحات  -

تاریخ انتشار 2010