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Updated: Aug 5, 2026
08:45
Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
Establishing Atomic Coherence in Twisted Oxide Membranes Containing Volatile Elements
Young-Hoon Kim1, Reza Ghanbari2, Min-Hyoung Jung3
1Center for Nanophase Materials Sciences (CNMS), Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee, USA.
Advanced Materials (Deerfield Beach, Fla.)
|July 29, 2026
Summary
Researchers created atomically coherent twisted oxide membranes by controlling oxygen annealing. This novel interface enables strain-tunable oxide moiré superlattices for quantum phenomena research.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Quantum Materials
Background:
- Twisted oxide membranes offer a platform for moiré physics and emergent quantum phenomena.
- Amorphous interfacial layers in heterostructures hinder coherent coupling and suppress moiré interactions.
- High-temperature treatments for interfacial bonding risk elemental loss in volatile materials.
Purpose of the Study:
- To demonstrate an atomically coherent, chemically bonded interface in twisted sodium niobate (NaNbO3) membranes.
- To investigate the nature of the interface formed via controlled oxygen-annealing.
- To establish a method for creating coherent and strain-tunable oxide moiré superlattices.
Main Methods:
- Controlled oxygen-annealing treatment of twisted NaNbO3 membranes.
- Atomic-resolution imaging (e.g., TEM) and spectroscopy (e.g., EELS/EDX).
- Analysis of lattice registry, strain propagation, and electronic structure.
Main Results:
- Achieved an atomically coherent and chemically bonded interface in twisted NaNbO3.
- Observed ordered perovskite registry with lattice contraction and modified electronic structure at the interface.
- Demonstrated highly asymmetric strain propagation, with significant shear strain in the top membrane.
Conclusions:
- Controlled oxygen annealing creates a chemically reconstructed interface, not just physical adhesion.
- The reconstructed interface enables coherent coupling and strain engineering in oxide moiré systems.
- This approach provides a pathway for realizing tunable oxide moiré superlattices for quantum applications.
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