Wednesday, December 5, 2012

1212.0550 (Dimitrios Toroz et al.)

Proposed alteration of images of molecular orbitals obtained using a
scanning tunnelling microscope as a probe of electron correlation

Dimitrios Toroz, Massimo Rontani, Stefano Corni
Scanning tunneling spectroscopy (STS) allows to image single molecules decoupled from the supporting substrate. The obtained images are routinely interpreted as the square moduli of molecular orbitals, dressed by the mean-field electron-electron interaction. Here we demonstrate that the effect of electron correlation beyond mean field qualitatively alters the uncorrelated STS images. Our evidence is based on the ab-initio many-body calculation of STS images of planar molecules with metal centers. We find that many-body correlations alter significantly the image spectral weight close to the metal center of the molecules. This change is large enough to be accessed experimentally, surviving to molecule-substrate interactions.
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