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11 janvier 2019: 1 événement

séminaire

  • Light cone effect and manipulation of energy current in spin systems

    Vendredi 11 janvier 11:00-12:30 - Carol Aguiar - UFMG Belo Horizonte

    Light cone effect and manipulation of energy current in spin systems

    Résumé : In this seminar, I will consider one dimensional systems of quantum spins that interact when in neighboring sites and are described by the Heisenberg XXZ model. I will show results of two recent works of our research group. In the first work, we study the non-equilibrium dynamics observed after connecting two XXZ chains, one initially prepared in the ferromagnetic phase and the other in the paramagnetic phase. When analyzing the magnetization and the entanglement entropy as a function of time and the chain site, we observe an effective light cone. In other words, there is a limit in the speed with which information propagates, which I will show to be related to different excitations of the equilibrium case. In the second work, we couple magnetic reservoirs to the edges of a spin chain in which the spin coupling in the z-direction varies gradually along the chain. We analyze the spin and energy currents through the chain when the non-equilibrium steady state is reached. According to our results, it is possible to manipulate the behavior of the energy current by applying an external magnetic field
    that also varies along the chain.

    Lieu : salle 315, aîle sud LPS, bât 510

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