2D Ferroelectrics Controls Quantum States in Single Molecules AaltoUniversity AdvSciNews
By Hussain AhmedJan 12 2023Reviewed by Megan Craig, M.Sc. The use of electric fields is a powerful approach to manipulate molecular electronic states, which can subsequently influence the optical properties, adsorption structures, oxidation states, vibrational frequencies, and chemical reactivity of molecules.
Ferroelectricity refers to the ability of certain materials to have a spontaneous electric polarization, which can be reversed by an applied electric field. In 2D materials, this polarization is confined to a single plane, which makes them particularly attractive for electronic device applications. However, with STM, a considerable electric field exists between the STM tip and the sample surface, which may trigger a radical change in the observed electronic properties in the tunneling spectra. By raising the set-point tunneling current, the distance between the tip and sample can be reduced, resulting in an enhancement in electric field strength.
Low-temperature STM and scanning tunneling spectroscopy were utilized to investigate how an in-plane electric field from the 2D-FE SnTe substrate influenced the molecular states. Density-functional theory calculations were also conducted to support the experimental results.
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