Visualizing Interface Quantum Physics on the Atomic Level*

Laughlin and Pines correctly observed “Seeing is the Beginning of Understanding.”  Modern aberration corrected electron microscopy and spectroscopy is allowing the community to “see” the origin of interfacial physics on an atomic scale, resulting the ability to “design” interfaces.  I will describe two different interface systems to illustrate recent progress: 1) New quantum states (magnetism) achieved at heterointerfaces, and; 2) Structural origin of optimal superconductivity in layered Fe based superconductor.  High-resolution electron microscopy and spectroscopy are revolutionizing our ability to see and control interfaces.