Exchange interaction and Fano resonances in diatomic molecular systems

Details Exchange interaction and Fano resonances in diatomic molecular systems Exchange interaction and Fano resonances in diatomic molecular systems

2006-09-13

arxiv.org/abs/cond-mat/0609324v3

Phys. Rev. B (Brief Reports) 75, 153309 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures, submitted - Changes in Fig. 1 (panel c) added), and minor modification in the main text - new version, as

Scientific paper

10.1103/PhysRevB.75.153309

We propose a mechanism to use scanning tunneling microscopy (STM) for direct measurements of the two-electron singlet-triplet exchange splitting $J$ in diatomic molecular systems, unsing the coupling between the molecule and the substrate electrons. The different pathways for electrons lead to interference effects and generate kinks in the differential conductance at the energies for the singlet and triplet states. These features are related to Fano resonance due to the branched electron wave functions. The ratio between the tunneling amplitudes through the two atoms can be modulated by spatial movements of the tip along the surface.

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