A new unified theory connects two fundamental domains of modern quantum physics: It joins two opposite views of how a single exotic particle behaves in a many-body system, namely as a mobile or static impurity among a large number of fermions, a so-called Fermi sea.

Phys is a blog or publication focused on physics, science, and mathematics. Readers can explore articles covering topics such as quantum mechanics, relativity, and cosmology. Additionally, they can learn about mathematical concepts, scientific theories, and the latest research in physics.

Phys.org

Researchers at Heidelberg University developed a unified theory connecting two previously separate paradigms in quantum physics: mobile and static impurity behavior in many-body systems. The framework explains how quasiparticles (Fermi polarons) emerge even when impurities are extremely heavy, bridging the gap between the established quasiparticle model and Anderson's orthogonality catastrophe. The theory reveals that heavy impurities perform slight motions as their environment adjusts, opening an energy gap that allows quasiparticle formation. This breakthrough has direct applications for experiments with ultracold atomic gases, two-dimensional materials, and novel semiconductors.

Physicists bridge worlds of quantum matter

Implications for future research and experiments