A non-oxidizing fabrication method for lithographic break junctions of sensitive metals

Area of Science:

• Materials Science
• Nanotechnology
• Condensed Matter Physics

Background:

• Electrochemically active metals offer enhanced functionalities over gold electrodes for atomic-scale electronic transport.
• Stronger interactions and metallic filament formation are key advantages, but fabrication challenges limit applications.

Purpose of the Study:

• To present a high-yield lithographic fabrication procedure for mechanically controllable break junctions using oxygen-sensitive metals.
• To enable the use of reactive metals, like silver, in atomic-scale electronic experiments.

Main Methods:

• High-yield lithography for fabricating mechanically controllable break junctions.
• Characterization of silver break junctions for mechanical and electrical stability.
• Demonstration of resistive switching in few-atom configurations.

Main Results:

• Fabrication of stable silver break junctions with single-atomic conductance at room temperature.
• Demonstrated superior mechanical and electrical stability of the silver junctions.
• Proof-of-principle demonstration of resistive switching between metastable few-atom configurations.

Conclusions:

• The developed lithographic technique successfully enables the fabrication of reliable break junctions using reactive metals.
• Silver break junctions show promise for advanced electronic transport experiments and atomic switch applications.
• This work expands the experimental toolkit for atomic-scale electronic studies.