Characterizing and understanding the 3D atomic structures of epitaxial interfaces are of great importance in fabricating high-performance electronic and magnetic devices. This project aims at developing a synchrotron X-ray based phase-retrieval imaging method, namely Coherent Bragg Rods Analysis (COBRA), and realizing the in-situ characterization of the precise 3D atomic structure of functional interfaces. By using COBRA method, this project systematically investigates the 'Tilt Epitaxy' effect near the complex oxides interfaces, which provides a general rule in optimizing the performance of ferroelectric devices. In the meantime, the phase-retrieval technique utilized in COBRA is applicable to a broad range of electron, X-ray, and laser based imaging methods.

Related works:

1. "Three-dimensional atomic scale electron density reconstruction of octahedral tilt epitaxy in functional perovskites" Nature Communications, 5220, 9, (2018)

2. "Polar metals by geometric design" Nature, 68-72, 533, (2016)

3. "Designing Optimal Perovskite Structure for High Ionic Conduction" Advanced Materials, 1905178, 32, (2020)

4. "Making EuO multiferroic by epitaxial strain engineering" Communications Materials, 1-10, 1, (2020)