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@ARTICLE{Haller:878332,
      author       = {Haller, Andreas and Rizzi, Matteo and Filippone, Michele},
      title        = {{D}rude weight increase by orbital and repulsive
                      interactions in fermionic ladders},
      journal      = {Physical review research},
      volume       = {2},
      number       = {2},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2020-02784},
      pages        = {023058},
      year         = {2020},
      abstract     = {In strictly one-dimensional systems, repulsive interactions
                      tend to reduce particle mobility on a lattice. Therefore,
                      the Drude weight, controlling the divergence at
                      zero-frequency of optical conductivities in perfect
                      conductors, is lower than in noninteracting cases. We show
                      that this is not the case when extending to
                      quasi-one-dimensional ladder systems. Relying on
                      bosonization, perturbative and matrix product states (MPS)
                      calculations, we show that nearest-neighbor interactions and
                      magnetic fluxes provide a bias between back- and
                      forward-scattering processes, leading to linear corrections
                      to the Drude weight in the interaction strength. As a
                      consequence, Drude weights counterintuitively increase
                      (decrease) with repulsive (attractive) interactions. Our
                      findings are relevant for the efficient tuning of Drude
                      weights in the framework of ultracold atoms trapped in
                      optical lattices and equally affect topological edge states
                      in condensed matter systems.},
      cin          = {PGI-8},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-8-20190808},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142) / 522 -
                      Controlling Spin-Based Phenomena (POF3-522)},
      pid          = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-522},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000602765300006},
      doi          = {10.1103/PhysRevResearch.2.023058},
      url          = {https://juser.fz-juelich.de/record/878332},
}