Yearbook 2013

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Ultracold atoms in optical lattices provide an optimal platform to study microscopic processes in quantum many-body systems. Theoretical models from solid state physics can be implemented in the laboratory and their predictions can be tested in novel ways. One of the recent advancements in the field is the realization of magnetic systems that can be manipulated on the level of single elementary magnets. Using this technique, fundamental magnetic excitations, so called magnons, and their dynamics and interactions have been recently observed. more
An exotic type of hydrogen, where the central nucleus – a single proton – is orbited by a muon instead of an electron, permits novel studies of the proton structure. The surprising result is that the charge radius of the proton is 4% smaller than previously measured. This “proton radius puzzle” has led to many speculations, even questioning the theory of quantum electrodynamics or the Standard Model of particle physics. Scientists at MPQ hope to shed new light on the “proton radius puzzle” using laser spectroscopy of muonic deuterium atoms and muonic helium ions. more
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