Origin and mechanism analysis of asymmetric current fluctuations in single-molecule junctions

Abstract

The asymmetric current noise in a single-molecule device was observed, which is relevant to an inelastic electron transport process.

Principal Component Analysis of Surface-Enhanced Raman Scattering Spectra Revealing Isomer-Dependent Electron Transport in Spiropyran Molecular Junctions: Implications for Nanoscale Molecular Electronics

“…This behavior is consistent with the previous observations made by the STM-BJ measurements and is attributed to the energy-level shift due to the asymmetric molecular orbital . In the present MCBJ studies, asymmetric I – V curves were also obtained for the SMJ of the MC form, and the asymmetric geometries at the molecule/electrode interfaces , in addition to the aforementioned asymmetric orbital of SP are the possible origins of asymmetry. Notably, although SP was initially introduced in the electrode, the formation of the SMJs of both SP and MC was observed, which was attributed to the thermal isomerization of the MC form, as mentioned below. , The coexistence of the two isomers could be presumed from the conductance measured by the MCBJ technique (see above).…”