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Related Experiment Video

Updated: May 2, 2026

Fabrication of Spatially Confined Complex Oxides

Fabrication of Spatially Confined Complex Oxides

Published on: July 1, 2013

Mind the Gap-Imaging Buried Interfaces in Twisted Oxide Moirés.

Harikrishnan Kp¹, Xin Wei^2,3, Chia-Hao Lee¹

¹School of Applied and Engineering Physics, Cornell University, Ithaca, New York, USA.

Advanced Materials (Deerfield Beach, Fla.)

|March 2, 2026

Summary

Interface roughness in twisted oxide membranes hinders atomic-scale contact, limiting potential for oxide twistronics. Advanced imaging techniques are crucial for understanding these challenges.

Keywords:

2D–3D heterostructures 3D imaging electron ptychography interfacial coupling moiré heterostructures oxide membranes

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Twisted stacks of 2D materials enable tuning of electronic structure via moiré physics.
Exploring similar moiré physics in twisted oxide membranes is motivated by this success.
Oxides' 3D bonding nature presents challenges for atomic-level interface coupling compared to 2D materials.

Purpose of the Study:

Investigate the impact of surface roughness on atomic-scale proximity in stacked oxide membranes.
Evaluate imaging techniques for characterizing interfaces in oxide membrane stacks.
Identify key challenges for realizing oxide twistronics.

Main Methods:

Fabrication of stacked oxide membranes.
Cross-sectional imaging for interface morphology analysis.
Comparison of conventional through-focal imaging and electron ptychography for interface characterization.

Main Results:

Surface roughness restricts atomic-scale proximity to isolated patches, even without contaminants.
2D materials' limited conformability to step-terrace topography further reduces atomic contact.
Electron ptychography reliably resolves nanometer-scale structural variations at buried interfaces, unlike conventional imaging.

Conclusions:

Interface topography is a critical factor limiting atomic coupling in stacked oxide membranes.
Achieving atomic-level proximity in oxide membrane interfaces is significantly challenged by surface roughness.
Interface characterization using advanced imaging is essential for advancing oxide twistronics research.