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. 2020 Apr 16;11(9):3660–3666. doi: 10.1021/acs.jpclett.0c00474

Figure 1.

Figure 1

(A) Schematic for the Kelvin probe microscopy experiment, in which the distance of an AFM tip from a SAM-coated ferromagnetic surface is varied sinusoidally, and its lateral position is scanned to image the substrate’s potential distribution. The diagram in panel B illustrates the idea that charge polarization is accompanied by spin polarization for chiral molecules. For a given enantiomer the interaction between the magnetized surface and the molecule follows either a low-spin (i) or a high-spin (ii) potential, depending on the direction of magnetization of the substrate. The bottom three panels show the contact potential (CPD) distributions for three different SAM-coated ferromagnetic substrates under two different magnetizations: the D-AL5 peptide (C), an achiral SAM (D) and an L-AL5 peptide (E). The blue color shows the CPD for a south magnetization, and red shows the CPD for a north magnetization. The zero voltage is set by the averaged contact potential difference found in the two measurements. Adapted from ref (23). Copyright 2020 American Chemical Society.