Hild, SebastianFukuhara, TakeshiSchauß, PeterZeiher, JohannesKnap, MichaelDemler, EugeneBloch, ImmanuelGross, Christian2015-09-302014Hild, Sebastian, Takeshi Fukuhara, Peter Schauß, Johannes Zeiher, Michael Knap, Eugene Demler, Immanuel Bloch, and Christian Gross. 2014. “Far-from-Equilibrium Spin Transport in Heisenberg Quantum Magnets.” Physical Review Letters 113 (14) (October). doi:10.1103/physrevlett.113.147205.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:22856734We study experimentally the far-from-equilibrium dynamics in ferromagnetic Heisenberg quantum magnets realized with ultracold atoms in an optical lattice. After controlled imprinting of a spin spiral pattern with an adjustable wave vector, we measure the decay of the initial spin correlations through single-site resolved detection. On the experimentally accessible time scale of several exchange times, we find a profound dependence of the decay rate on the wave vector. In one-dimensional systems, we observe diffusionlike spin transport with a dimensionless diffusion coefficient of 0.22(1). We show how this behavior emerges from the microscopic properties of the closed quantum system. In contrast to the one-dimensional case, our transport measurements for two-dimensional Heisenberg systems indicate anomalous superdiffusion.en-USJournal Article2015-09-3010.1103/PhysRevLett.113.147205