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000837948 1001_ $$0P:(DE-HGF)0$$aSteinigeweg, R$$b0
000837948 1112_ $$aBig ideas in quantum matter$$cNijmegen$$d2017-09-14 - 2017-09-15$$wThe Netherlands
000837948 245__ $$aReal-time broadening of nonequilibrium density profiles and the role of the specific initial-state realization
000837948 260__ $$c2017
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000837948 520__ $$aThe real-time broadening of density profiles starting from nonequilibrium states is at the center of transportin condensed-matter systems and dynamics in ultracold atomic gases. Initial profiles close to equilibrium areexpected to evolve according to the linear response, e.g., as given by the current correlator evaluated exactly atequilibrium. Significantly off equilibrium, the linear response is expected to break down and even a description interms of canonical ensembles is questionable.We unveil that single pure states with density profiles of maximumamplitude yield a broadening in perfect agreement with the linear response, if the structure of these statesinvolves randomness in terms of decoherent off-diagonal density-matrix elements. While these states allow forspin diffusion in the XXZ spin-1/2 chain at large exchange anisotropies, coherences yield entirely differentbehavior.
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000837948 7001_ $$0P:(DE-Juel1)144355$$aJin, Fengping$$b1$$eCorresponding author$$ufzj
000837948 7001_ $$0P:(DE-HGF)0$$aSchmidtke, D$$b2
000837948 7001_ $$0P:(DE-HGF)0$$aDe Raedt, H$$b3
000837948 7001_ $$0P:(DE-Juel1)138295$$aMichielsen, Kristel$$b4$$ufzj
000837948 7001_ $$0P:(DE-HGF)0$$aGemmer, J$$b5
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