Механічний контроль спінових станів

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Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect

The ability to make electrical contact to single molecules creates opportunities to examine fundamental processes governing electron flow on the smallest possible length scales. We report experiments in which we controllably stretched individual cobalt complexes having spin S = 1, while simultaneously measuring current flow through the molecule. The molecule’s spin states and magnetic anisotropy were manipulated in the absence of a magnetic field by modification of the molecular symmetry. This control enabled quantitative studies of the underscreened Kondo effect, in which conduction electrons only partially compensate the molecular spin. Our findings demonstrate a mechanism of spin control in single-molecule devices and establish that they can serve as model systems for making precision tests of correlated-electron theories.

Science http://www.sciencemag.org/cgi/content/abstract/328/5984/1370

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Допоміжна стаття:

Pulling Apart Molecular Magnetism

A single molecule constitutes the ultimate nanometer-scale object through which electronic transport can take place. Being so small, molecules share many characteristics with atoms, such as discrete quantized energy spectra and angular momentum, yet at the same time are large enough to be mechanically deformed and chemically attached to metallic leads with which they can exchange electrons. Can these mechanical and exchange interactions be controlled and, if so, what new phenomena arise? On page 1370 of this issue, Parks et al. show how magnetism and quantum many-body phenomena can be tuned by precise mechanical manipulation of single molecules.

Science http://www.sciencemag.org/cgi/content/summary/328/5984/1362