TY  - CONF
AU  - Steinigeweg, R.
AU  - Jin, Fengping
AU  - Schmidtke, D.
AU  - De Raedt, H.
AU  - Michielsen, Kristel
AU  - Gemmer, J.
TI  - Real-time broadening of nonequilibrium density profiles and the role of the specific initial-state realization
M1  - FZJ-2018-01598
PY  - 2018
AB  - The real-time broadening of density profiles starting from nonequilibrium states is at the center of transport in condensed-matter systems and dynamics in ultracold atomic gases. Initial profiles close to equilibrium are expected to evolve according to the linear response, e.g., as given by the current correlator evaluated exactly at equilibrium. Significantly off equilibrium, the linear response is expected to break down and even a description in terms of canonical ensembles is questionable.We unveil that single pure states with density profiles of maximum amplitude yield a broadening in perfect agreement with the linear response, if the structure of these states involves randomness in terms of decoherent off-diagonal density-matrix elements. While these states allow for spin diffusion in the XXZ spin-1/2 chain at large exchange anisotropies, coherences yield entirely different behavior.
T2  - NIC Symposium 2018
CY  - 22 Feb 2018 - 23 Feb 2018, Jülich (Germany)
Y2  - 22 Feb 2018 - 23 Feb 2018
M2  - Jülich, Germany
LB  - PUB:(DE-HGF)24
UR  - https://juser.fz-juelich.de/record/844132
ER  -