Recent advances in synthesizing complex oxide epitaxial heterostructures with precise
control in atomic scale have opened a new era of materials science and engineering
research, enabling discoveries of novel physical phenomena even from materials that have
been studied for a long time. The exquisite control of high-quality thin films through
composition, defects, strain, and microstructure allows us to clearly distinguish intrinsic and
extrinsic properties that were obscured by the limitation of sample quality. This is vividly …