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@ARTICLE{Contessi:904515,
      author       = {Contessi, Daniele and Romito, Donato and Rizzi, Matteo and
                      Recati, Alessio},
      title        = {{C}ollisionless drag for a one-dimensional two-component
                      {B}ose-{H}ubbard model},
      journal      = {Physical review research},
      volume       = {3},
      number       = {2},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2021-06085},
      pages        = {L022017},
      year         = {2021},
      abstract     = {We theoretically investigate the elusive Andreev-Bashkin
                      collisionless drag for a two-component one-dimensional
                      Bose-Hubbard model on a ring. By means of tensor network
                      algorithms, we calculate the superfluid stiffness matrix as
                      a function of intra- and interspecies interactions and of
                      the lattice filling. We then focus on the most promising
                      region close to the so-called pair-superfluid phase, where
                      we observe that the drag can become comparable with the
                      total superfluid density. We elucidate the importance of the
                      drag in determining the long-range behavior of the
                      correlation functions and the spin speed of sound. In this
                      way, we are able to provide an expression for the spin
                      Luttinger parameter $K_S$ in terms of drag and the spin
                      susceptibility. Our results are promising in view of
                      implementing the system by using ultracold Bose mixtures
                      trapped in deep optical lattices, where the size of the
                      sample is of the same order of the number of particles we
                      simulate. Importantly, the mesoscopicity of the system, far
                      from being detrimental, appears to favor a large drag,
                      avoiding the Berezinskii-Kosterlitz-Thouless jump at the
                      transition to the pair-superfluid phase which would reduce
                      the region where a large drag can be observed.},
      cin          = {PGI-8},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-8-20190808},
      pnm          = {5221 - Advanced Solid-State Qubits and Qubit Systems
                      (POF4-522)},
      pid          = {G:(DE-HGF)POF4-5221},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000655983400007},
      doi          = {10.1103/PhysRevResearch.3.L022017},
      url          = {https://juser.fz-juelich.de/record/904515},
}