The structural behavior of physisorbed metallenes

Area of Science:

• Materials Science
• Condensed Matter Physics
• Surface Science

Background:

• Atomically thin metallenes exhibit promising properties for various applications.
• Their intrinsic instability necessitates stabilization, often within nano-constrictions or on substrates.
• Physisorption on substrates offers a method to retain metallenes' essential properties.

Purpose of the Study:

• To investigate the structural properties of 45 physisorbed, atomically thin metallene structures.
• To understand the influence of substrate interactions and external stimuli on metallene lattice configurations.
• To identify methods for controlling metallene structures for potential applications.

Main Methods:

• Utilized a sequential multi-scale model.
• Employed density-functional theory calculations.
• Studied both flat and buckled lattice structures under varying physisorption strengths.

Main Results:

• Metallene lattices are predominantly buckled, with exceptions like Na, K, Rb, Ag, Au, and Cd forming flat structures depending on physisorption strength.
• Biaxial tensile stress can reduce the adhesion strength required to flatten buckled lattices.
• Normal electric fields can controllably increase the threshold adhesion strength needed for lattice flattening.

Conclusions:

• Physisorbed metallenes exhibit diverse lattice structures influenced by substrate interactions.
• External stimuli, specifically tensile stress and electric fields, offer tunable control over metallene structural stability.
• This fundamental understanding facilitates the deliberate engineering of metallene structures through substrate selection and parameter tuning.