The world around us is not in equilibrium, but slowly (or quickly) getting there through transport of conserved quantities such as energy, charge, and momentum. However transport is challenging to calculate ab initio, leaving many open questions (such as high-temperature superconductivity) and room for new paradigms (such as holographic duality). Ultracold atoms provides an ideal platform for the study of non-equilibrium quantum physics, since samples are isolated from the environment, and the strength of interactions can be tuned. We have observed a kind of quantum "speed limit" on the rate of spin diffusion in a Fermi gas. I will discuss how this is measured, and its relation to various conjectured bounds.
Joseph Thywissen / University of Toronto
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