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15 avril 2021: 1 événement


  • Hydrodynamics in Quantum Magnets

    Jeudi 15 avril 16:00-17:00 - Maxime Dupont - Lawrence Berkeley National Laboratory & University of California, Berkeley

    Hydrodynamics in Quantum Magnets

    Résumé : Some quantum many-body systems display emergent coarse-grained hydrodynamic behavior. One can make an analogy with the phenomenological derivation of classical fluid dynamics, based on the continuity equations of conserved quantities (such as mass or energy). Depending on the intrinsic quantum conservation laws of the system, one expects different kinds of fluid-like behaviors. Remarkably, a class of 1D quantum systems, known as integrable, possesses an infinite number of nontrivial conserved quantities. These can endow them with peculiar transport properties, especially at high temperatures.
    I will present to you how the different hydrodynamic regimes in 1D quantum magnets are classified [1]. I will also discuss a recent theoretical-experimental collaboration [2] observing with neutrons one of these regimes in a nearly-ideal antiferromagnetic spin-1/2 Heisenberg chain material (KCuF3). We found that the spin dynamics belong to the Kardar-Parisi-Zhang universality class in 1+1 dimensions, confirming the recent theoretical conjecture.
    [1] M. Dupont and J. E. Moore, Phys. Rev. B 101, 121106(R) (2020).
    [2] A. Scheie, Sherman, N.E., Dupont, M. et al., Nat. Phys. (2021).

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