Probing Surface-Mediated Electronic Coupling in Flat Hexagonal Phosphorus Nanostructures and Monolayer on Au(111)

Area of Science:

• Materials Science
• Condensed Matter Physics
• Surface Science

Background:

• Two-dimensional (2D) phosphorus, or phosphorene, is a material of significant interest due to its unique properties and allotropes.
• Understanding the growth and electronic behavior of phosphorene on surfaces is crucial for its technological applications.

Purpose of the Study:

• To report the successful growth of flat hexagonal 2D phosphorus (HexP) on an Au(111) surface.
• To investigate the structural and electronic properties of phosphorene structures formed during deposition.
• To explore the origin of novel electronic properties arising from phosphorene-gold interactions.

Main Methods:

• Scanning Tunneling Microscopy/Spectroscopy (STM/STS) for structural and electronic characterization.
• Ab initio calculations to complement experimental observations and understand electronic properties.
• Controlled deposition of phosphorus on Au(111) to study phase evolution.

Main Results:

• Successful growth of ordered phosphorus structures on Au(111), evolving from linear chains to a porous network, and finally to a 2D flat hexagonal (HexP) layer.
• Observation of a progressive formation of a phosphorus electronic band in the conduction band region.
• Discovery of a unique partial flatband in the HexP phase, attributed to phosphorus-gold hybridization.
• Demonstration of gold-mediated electronic coupling between phosphorus atoms in the HexP phase.

Conclusions:

• The growth of flat hexagonal 2D phosphorus on Au(111) is achieved, revealing distinct structural phases.
• The HexP phase exhibits remarkable electronic properties, including a partial flatband, due to strong hybridization with the gold substrate.
• This study highlights the potential of phosphorene-gold interfaces for developing advanced electronic materials.