Far-from-Equilibrium Spin Transport in Heisenberg Quantum Magnets

2014/07/31 by Sebastian Hild, Takeshi Fukuhara, Peter Schauß +6 · 10 citations
Physics and Astronomy · #Condensed matter physics #Ferromagnetism #Heisenberg model #Magnet #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum and electron transport phenomena #Quantum many-body systems #Quantum mechanics #Spin (aerodynamics) #Thermodynamics #cond-mat.quant-gas #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.113.147205

published as Phys. Rev. Lett. 113, 147205 (2014)

openalex publication_date 2014/10/03 · arxiv created 2014/11/07 · arxiv updated 2014/11/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study experimentally the far-from-equilibrium dynamics in ferromagnetic Heisenberg quantum magnets realized with ultracold atoms in an optical lattice. After controlled imprinting of a spin spiral pattern with an adjustable wave vector, we measure the decay of the initial spin correlations through single-site resolved detection. On the experimentally accessible time scale of several exchange times, we find a profound dependence of the decay rate on the wave vector. In one-dimensional systems, we observe diffusionlike spin transport with a dimensionless diffusion coefficient of 0.22(1). We show how this behavior emerges from the microscopic properties of the closed quantum system. In contrast to the one-dimensional case, our transport measurements for two-dimensional Heisenberg systems indicate anomalous superdiffusion.

Citations

• Local Conservation Laws and the Structure of the Many-Body Localized States
• Collinear Four-Wave Mixing of Two-Component Matter Waves
• O<mml:mprescripts/>17NMR Study ofq<mml:mspace/>=<mml:mspace/>0Spin Excitations in a Nearly IdealS<mml:mspace/>=<mml:mspace/>121D Heisenberg Antiferromagnet,Sr2CuO3, up to 800 K
• Localization of interacting fermions at high temperature
• Phase diagram of two-component bosons on an optical lattice

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