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• W3102251451 abstract "Pumping a finite energy density into a quantum system typically leads to `melted' states characterized by exponentially-decaying correlations, as is the case for finite-temperature equilibrium situations. An important exception to this rule are states which, while being at high energy, maintain a low entropy. Such states can interestingly still display features of quantum criticality, especially in one dimension. Here, we consider high-energy states in anisotropic Heisenberg quantum spin chains obtained by splitting the ground state's magnon Fermi sea into separate pieces. Using methods based on integrability, we provide a detailed study of static and dynamical spin-spin correlations. These carry distinctive signatures of the Fermi sea splittings, which would be observable in eventual experimental realizations. Going further, we employ a multi-component Tomonaga-Luttinger model in order to predict the asymptotics of static correlations. For this effective field theory, we fix all universal exponents from energetics, and all non-universal correlation prefactors using finite-size scaling of matrix elements. The correlations obtained directly from integrability and those emerging from the Luttinger field theory description are shown to be in extremely good correspondence, as expected, for the large distance asymptotics, but surprisingly also for the short distance behavior. Finally, we discuss the description of dynamical correlations from a mobile impurity model, and clarify the relation of the effective field theory parameters to the Bethe Ansatz solution." @default.
• W3102251451 created "2020-11-23" @default.
• W3102251451 creator A5015389043 @default.
• W3102251451 creator A5037895559 @default.
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• W3102251451 date "2016-10-25" @default.
• W3102251451 modified "2023-09-26" @default.
• W3102251451 title "Correlations of zero-entropy critical states in the XXZ model: integrability and Luttinger theory far from the ground state" @default.
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• W3102251451 doi "https://doi.org/10.21468/scipostphys.1.1.008" @default.
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