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Creators/Authors contains: "Vasseur, Romain"

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  1. ; ; ; ( , Physical Review Letters)
    Although integrable spin chains only host ballistically propagating particles they can still feature diffusive spin transport. This diffusive spin transport originates from quasiparticle charge fluctuations inherited from the initial state's magnetization Gaussian fluctuations. We show that ensembles of initial states with quasi-long range correlations lead to superdiffusive spin transport with a tunable dynamical exponent. We substantiate our prediction with numerical simulations and explain how deviations arise from finite time and finite size effects. 
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    Free, publicly-accessible full text available April 1, 2025
  2. ; ; ( , Physical Review B)
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  3. ; ; ; ( , Physical Review B)
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  4. ; ; ; ; ( , Physical Review Letters)
    Free, publicly-accessible full text available December 1, 2024
  5. ; ; ( , Physical Review Letters)
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  6. ; ; ; ( , Physical Review Letters)
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  7. ; ; ; ( , Physical Review B)
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  8. ; ; ; ; ; ( , Physical Review B)
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  9. ; ( , Reports on Progress in Physics)
    Abstract

    Many experimentally relevant quantum spin chains are approximately integrable, and support long-lived quasiparticle excitations. A canonical example of integrable model of quantum magnetism is the XXZ spin chain, for which energy spreads ballistically, but, surprisingly, spin transport can be diffusive or superdiffusive. We review the transport properties of this model using an intuitive quasiparticle picture that relies on the recently introduced framework of generalized hydrodynamics. We discuss how anomalous linear response properties emerge from hierarchies of quasiparticles both in integrable and near-integrable limits, with an emphasis on the role of hydrodynamic fluctuations. We also comment on recent developments including non-linear response, full-counting statistics and far-from-equilibrium transport. We provide an overview of recent numerical and experimental results on transport in XXZ spin chains.

     
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  10. ; ; ; ; ; ; ( , Physical Review B)