Interactions

Physics interactions: As a young Ph.D. student in Manuel’s early Stuttgart group trying to understand resonance Raman scattering, it was natural to approach the new results we measured on the one- and two-phonon resonances in GaP through the eye of Feynman Diagrams, freshly learned a year earlier from my courses at Brown University. This was fine as a starting point. But when I sat down with Manuel in his office to discuss the findings, we used a different sort of diagram that clarified many details of the physics. And so, as sketched here, Manuel transformed the familiar bubble diagrams into an approach grounded firmly in the physics of the medium.