Redesigning metals at the atomic level: Tuning atomic interfaces for future tech

University of Minnesota researchers have found a way to “redesign” metals by stabilising polarisation at the atomic level—a feat previously thought impossible for metallic systems

By manipulating a 4-nanometer-thick layer of ruthenium dioxide, they can tune its electronic properties with extreme precision, paving the way for faster, more efficient electronics and quantum devices.

Published in Nature Communications, the study demonstrates that “interfacial polarisation”—a property traditionally associated with insulators—can be stabilised in metallic systems to tune their electronic properties with extreme precision.

Breaking the rules of metal physics

In the world of materials science, scientists often think of polarisation as something that belongs strictly to insulators or ferroelectrics—not metals. However, Professor Bharat Jalan and his team showed that through careful interface design, polarisation can act as a “knob” to tune the work function of a metal.

By adjusting the film thickness of metallic ruthenium dioxide (RuO2) at the nanometer scale, they were able to change its surface work function by more than 1 electron volt (eV).

This transition is most effective when the metal layer is approximately 4 nanometers thick, which is roughly the width of a single strand of DNA. At this specific thickness, the metal shifts from a “stretched” state caused by the material beneath it to a “relaxed” state.

This physical shift in how atoms are packed together has a direct, measurable impact on how the metal handles electricity, proving that structural “strain” can be used to engineer better electronic components.

Impact on next-gen devices

The ability to redesign metals at the atomic level opens an entirely new way of thinking about material control, with broad implications for several fields:

• Faster electronics:

  • Manipulating the work function can lead to devices that are more energy-efficient and operate at higher speeds.

• Tunable catalysis:

  • The discovery could help create more efficient chemical reactions by adjusting the electronic properties of metallic catalysts.

• Quantum technology:

  • These findings provide new avenues for designing the interfaces required for advanced quantum devices.