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@ARTICLE{Richter:885867,
      author       = {Richter, Jonas and Jin, Fengping and Knipschild, Lars and
                      De Raedt, Hans and Michielsen, Kristel and Gemmer, Jochen
                      and Steinigeweg, Robin},
      title        = {{E}xponential damping induced by random and realistic
                      perturbations},
      journal      = {Physical review / E},
      volume       = {101},
      number       = {6},
      issn         = {2470-0045},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2020-04143},
      pages        = {062133},
      year         = {2020},
      abstract     = {Given a quantum many-body system and the expectation-value
                      dynamics of some operator, we study how this reference
                      dynamics is altered due to a perturbation of the system's
                      Hamiltonian. Based on projection operator techniques, we
                      unveil that if the perturbation exhibits a random-matrix
                      structure in the eigenbasis of the unperturbed Hamiltonian,
                      then this perturbation effectively leads to an exponential
                      damping of the original dynamics. Employing a combination of
                      dynamical quantum typicality and numerical linked cluster
                      expansions, we demonstrate that our theoretical findings for
                      random matrices can, in some cases, be relevant for the
                      dynamics of realistic quantum many-body models as well.
                      Specifically, we study the decay of current autocorrelation
                      functions in spin-1/2 ladder systems, where the rungs of the
                      ladder are treated as a perturbation to the otherwise
                      uncoupled legs. We find a convincing agreement between the
                      exact dynamics and the lowest-order prediction over a wide
                      range of interchain couplings.},
      cin          = {JSC / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JSC-20090406 / $I:(DE-82)080012_20140620$},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / Manipulation and dynamics of quantum spin
                      systems $(jjsc09_20190501)$},
      pid          = {G:(DE-HGF)POF3-511 / $G:(DE-Juel1)jjsc09_20190501$},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:32688487},
      UT           = {WOS:000541417200003},
      doi          = {10.1103/PhysRevE.101.062133},
      url          = {https://juser.fz-juelich.de/record/885867},
}