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  1. Home
  3. Strain-stabilized Interfacial Polarization Tunes Work Function Over 1 Ev In Ruo2/tio2 Heterostructures.
  1. Home
  3. Strain-stabilized Interfacial Polarization Tunes Work Function Over 1 Ev In Ruo2/tio2 Heterostructures.

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Strain-stabilized interfacial polarization tunes work function over 1 eV in RuO2/TiO2 heterostructures.

Seung Gyo Jeong1, Bonnie Y X Lin2, Mengru Jin3

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota-Twin Cities, Minneapolis, MN, USA. jeong397@umn.edu.

Nature Communications
|February 9, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Interfacial polarization, charge accumulation at interfaces, is shown to control metal work functions. This discovery enables tunable electronic properties in metallic systems.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Interfacial polarization is a known phenomenon in semiconductors.
  • Its role in metallic systems, particularly in modulating electronic properties, remains largely unexplored.

Purpose of the Study:

  • To investigate the influence of interfacial polarization on the work function of metallic rutile ruthenium dioxide (RuO2).
  • To explore the potential for controlling electronic properties in metals through interfacial engineering.

Main Methods:

  • Epitaxial growth of RuO2/TiO2 heterostructures using hybrid molecular beam epitaxy.
  • Direct visualization of polar ionic displacements near the interface using multislice electron ptychography.
  • Measurement of work function modulation via Kelvin probe force microscopy.

Main Results:

  • Demonstrated robust modulation of the RuO2 surface work function by over 1 eV.
  • Observed significant work function changes with small variations in RuO2 film thickness (2-3 nm).
  • Identified a critical thickness of approximately 4 nm for the transition from strained to relaxed films, correlating with polarization effects.

Conclusions:

  • Interfacial polarization is a viable mechanism for tuning the electronic properties of metallic systems.
  • This finding opens avenues for designing advanced electronic, catalytic, and quantum devices by controlling interfaces in polar metallic materials.