Exchange interaction and Fano resonances in diatomic molecular systems

Abstract

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.

arXiv comment4 pages, 2 figures, submitted - Changes in Fig. 1 (panel c) added), and minor modification in the main text - new version, as published

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Cited by in corpus (4)

• Fano resonances in nanoscale structures
• Anomalous Fano Resonance in Double Quantum Dot System Coupled to Superconductor
• Effect of quasi-bound states on coherent electron transport in twisted nanowires
• Detection of exchange interaction in STM measurements through Fanolike interference effects