Formation of dispersive hybrid bands at an organic-metal interface

TL;DR

This study reveals the formation of anisotropic hybrid electronic bands at an organic-metal interface, demonstrating how molecular layer composition can engineer the electronic properties of such interfaces.

Contribution

It uncovers the mechanism of hybrid band formation through molecular-metal state mixing and shows how to tune their dimensionality and dispersion.

Findings

Hybrid bands exhibit quasi-one-dimensional dispersion.

Molecular layer folding influences metal state mixing.

Tuning molecular components alters interface electronic properties.

Abstract

An electronic band with quasi-one dimensional dispersion is found at the interface between a monolayer of a charge-transfer complex (TTF-TCNQ) and a Au(111) surface. Combined local spectroscopy and numerical calculations show that the band results from a complex mixing of metal and molecular states. The molecular layer folds the underlying metal states and mixes with them selectively, through the TTF component, giving rise to anisotropic hybrid bands. Our results suggest that, by tuning the components of such molecular layers, the dimensionality and dispersion of organic-metal interface states can be engineered.