Mechanically Programmable Tristate Molecular Switching Through Controlled Fullerene Assembly.

Area of Science:

• Molecular Electronics
• Nanotechnology
• Materials Science

Background:

• Molecular electronics aims to surpass binary functionality with multistate control.
• Achieving reliable multistate switching at the molecular scale is a key challenge.

Purpose of the Study:

• To demonstrate a mechanically programmable and reversible tristate molecular junction.
• To explore fullerene (C₆₀) molecule assembly for multistate conductance control.

Main Methods:

• Utilized scanning tunneling microscope-break junction (STM-BJ) technique.
• Employed low-temperature STM, noise analysis, and transport calculations.
• Investigated mechanical push-pull modulation for junction control.

Main Results:

• Identified three discrete conductance states spanning over four orders of magnitude.
• Demonstrated reversible access to these states via mechanical modulation.
• Attributed states to the controlled stacking of one, two, or three C₆₀ molecules.

Conclusions:

• Mechanically controlled intermolecular assembly offers a route to deterministic multistate molecular switching.
• Fullerene-based junctions provide robust, configuration-insensitive multistate transport.
• This approach is relevant for adaptive and neuromorphic-inspired electronic systems.