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@ARTICLE{Khedri:840275,
      author       = {Khedri, A. and Costi, Theodoulos and Meden, V.},
      title        = {{E}xponential and power-law renormalization in
                      phonon-assisted tunneling},
      journal      = {Physical review / B},
      volume       = {96},
      number       = {19},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-07822},
      pages        = {195155},
      year         = {2017},
      abstract     = {We investigate the spinless Anderson-Holstein model
                      routinely employed to describe the basic physics of
                      phonon-assisted tunneling in molecular devices. Our focus is
                      on small to intermediate electron-phonon coupling; we
                      complement a recent strong coupling study [Phys. Rev. B 87,
                      075319 (2013)]. The entire crossover from the antiadiabatic
                      regime to the adiabatic one is considered. Our analysis
                      using the essentially analytical functional renormalization
                      group approach backed up by numerical renormalization group
                      calculations goes beyond lowest order perturbation theory in
                      the electron-phonon coupling. In particular, we provide an
                      analytic expression for the effective tunneling coupling at
                      particle-hole symmetry valid for all ratios of the bare
                      tunnel coupling and the phonon frequency. It contains the
                      exponential polaronic as well as the power-law
                      renormalization in the electron-phonon interaction; the
                      latter can be traced back to x-ray edgelike physics. In the
                      antiadiabatic and the adiabatic limit this expression agrees
                      with the known ones obtained by mapping to an effective
                      interacting resonant level model and lowest order
                      perturbation theory, respectively. Away from particle-hole
                      symmetry, we discuss and compare results from several
                      approaches for the zero temperature electrical conductance
                      of the model.},
      cin          = {IAS-3 / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-3-20090406 / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142) /
                      Thermoelectric properties of molecular quantum dots and
                      time-dependent response of quantum dots $(jiff23_20140501)$},
      pid          = {G:(DE-HGF)POF3-142 / $G:(DE-Juel1)jiff23_20140501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000416235500007},
      doi          = {10.1103/PhysRevB.96.195155},
      url          = {https://juser.fz-juelich.de/record/840275},
}