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@ARTICLE{Bera:837027,
      author       = {Bera, A. K. and Lake, B. and Essler, F. H. L. and
                      Vanderstraeten, L. and Hubig, C. and Schollwöck, U. and
                      Islam, A. T. M. N. and Schneidewind, A. and Quintero-Castro,
                      D. L.},
      title        = {{S}pinon confinement in a quasi-one-dimensional anisotropic
                      {H}eisenberg magnet},
      journal      = {Physical review / B},
      volume       = {96},
      number       = {5},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-06043},
      pages        = {054423},
      year         = {2017},
      abstract     = {Confinement is a process by which particles with fractional
                      quantum numbers bind together to formquasiparticles with
                      integer quantum numbers. The constituent particles are
                      confined by an attractive interactionwhose strength
                      increases with increasing particle separation and, as a
                      consequence, individual particles arenot found in isolation.
                      This phenomenon is well known in particle physics where
                      quarks are confined inbaryons and mesons. An analogous
                      phenomenon occurs in certain spatially anisotropic magnetic
                      insulators.These can be thought of in terms of weakly
                      coupled chains of spins S = 1/2, and a spin flip thus
                      carriesinteger spin S = 1. The collective excitations in
                      these systems, called spinons, turn out to carry fractional
                      spinquantum number S = 1/2. Interestingly, at sufficiently
                      low temperatures the weak coupling between chains caninduce
                      an attractive interaction between pairs of spinons that
                      increases with their separation and thus leads
                      toconfinement. In this paper, we employ inelastic neutron
                      scattering to investigate the spinon-confinement processin
                      the quasi-one-dimensional, spin-1/2 antiferromagnet with
                      Heisenberg-Ising (XXZ) anisotropy SrCo2V2O8.A wide
                      temperature range both above and below the long-range
                      ordering temperature TN = 5.2 K is explored.Spinon
                      excitations are observed above TN in quantitative agreement
                      with established theory. Below TN pairs ofspinons are
                      confined and two sequences of meson-like bound states with
                      longitudinal and transverse polarizationsare observed.
                      Several theoretical approaches are used to explain the data.
                      These are based on a description interms of a
                      one-dimensional, S = 1/2 XXZ antiferromagnetic spin chain,
                      where the interchain couplings aremodeled by an effective
                      staggered magnetic mean field. A wide range of exchange
                      anisotropies are investigatedand the parameters specific to
                      SrCo2V2O8 are identified. Recently developed theoretical
                      technique based ontangent-space matrix product states gives
                      a very complete description of the data and provides good
                      agreementnot onlywith the energies of the bound modes but
                      also with their intensities.We also successfully explain the
                      effectof temperature on the excitations including the
                      experimentally observed thermally induced resonance
                      betweenlongitudinal modes below TN and the transitions
                      between thermally excited spinon states above TN. In
                      summary,our work establishes SrCo2V2O8 as a beautiful
                      paradigm for spinon confinement in a
                      quasi-one-dimensionalquantum magnet and provides a
                      comprehensive picture of this process.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)PANDA-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000407777600003},
      doi          = {10.1103/PhysRevB.96.054423},
      url          = {https://juser.fz-juelich.de/record/837027},
}