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Quantum simulation. Two-dimensional superexchange-mediated magnetization dynamics in an optical lattice

Brown, R C ; Wyllie, R ; Koller, S B ; Goldschmidt, E A ; Foss-Feig, M ; Porto, J V

Science (New York, N.Y.), 01 May 2015, Vol.348(6234), pp.540-4 [Periódico revisado por pares]

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  • Título:
    Quantum simulation. Two-dimensional superexchange-mediated magnetization dynamics in an optical lattice
  • Autor: Brown, R C ; Wyllie, R ; Koller, S B ; Goldschmidt, E A ; Foss-Feig, M ; Porto, J V
  • É parte de: Science (New York, N.Y.), 01 May 2015, Vol.348(6234), pp.540-4
  • Descrição: The interplay of magnetic exchange interactions and tunneling underlies many complex quantum phenomena observed in real materials. We study nonequilibrium magnetization dynamics in an extended two-dimensional (2D) system by loading effective spin-1/2 bosons into a spin-dependent optical lattice and use the lattice to separately control the resonance conditions for tunneling and superexchange. After preparing a nonequilibrium antiferromagnetically ordered state, we observe relaxation dynamics governed by two well-separated rates, which scale with the parameters associated with superexchange and tunneling. With tunneling off-resonantly suppressed, we observe superexchange-dominated dynamics over two orders of magnitude in magnetic coupling strength. Our experiment will serve as a benchmark for future theoretical work as the detailed dynamics of this 2D, strongly correlated, and far-from-equilibrium quantum system remain out of reach of current computational techniques.
  • Idioma: Inglês

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