A Single Molecule Kondo Switch: Multistability of Tetracyanoethylene on Cu(111)

Single tetracyanoethyelene (TCNE) molecules on Cu(111) are reversibly switched among five states by applying voltage pulses with the tip of a scanning tunneling microscope. A pronounced Kondo resonance in tunneling spectroscopy indicates that one of the states is magnetic. Side bands of the Kondo re...

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Veröffentlicht in:Nano letters 2010-10, Vol.10 (10), p.4175-4180
Hauptverfasser: Choi, Taeyoung, Bedwani, Stéphane, Rochefort, Alain, Chen, Chia-Yi, Epstein, Arthur J., Gupta, Jay A.
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Sprache:eng
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Zusammenfassung:Single tetracyanoethyelene (TCNE) molecules on Cu(111) are reversibly switched among five states by applying voltage pulses with the tip of a scanning tunneling microscope. A pronounced Kondo resonance in tunneling spectroscopy indicates that one of the states is magnetic. Side bands of the Kondo resonance appear at energies which correspond to inter- and intramolecular vibrational modes. Density functional theory suggests that molecular deformation changes the occupancy in TCNE’s molecular orbitals, thus producing the magnetic state.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl1024563