Dynamics of rotated spin states and magnetic ordering with two-component bosonic atoms in optical lattices

Venegas-Gomez, Araceli and Buyskikh, Anton S. and Schachenmayer, Johannes and Ketterle, Wolfgang and Daley, Andrew J. (2020) Dynamics of rotated spin states and magnetic ordering with two-component bosonic atoms in optical lattices. Physical Review A, 102 (2). 023321. ISSN 2469-9926 (https://doi.org/10.1103/PhysRevA.102.023321)

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Abstract

The microscopic control available over cold atoms in optical lattices has opened new opportunities to study the properties of quantum spin models. While a lot of attention is focused on experimentally realizing ground or thermal states via adiabatic loading, it would often be more straightforward to prepare specific simple product states and to probe the properties of interacting spins by observing their dynamics. We explore this possibility for spin-1/2 and spin-1 models that can be realized with bosons in optical lattices, and which exhibit XY-ferromagnetic (or counterflow spin-superfluid) phases. We consider the dynamics of initial spin-rotated states corresponding to a mean-field version of the phases of interest. Using matrix product state methods in one dimension, we compute both nonequilibrium dynamics and ground and thermal states for these systems. We compare and contrast their behavior in terms of correlation functions and induced spin currents, which should be directly observable with current experimental techniques. We find that although spin correlations decay substantially at large distances and on long timescales, for induction of spin currents, the rotated states behave similarly to the ground states on experimentally observable timescales.

  • Item type:Article
    ID code:76765
    Dates:
    Date
    Event
    20 August 2020
    Published
    28 July 2020
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:14 Jun 2021 14:27
    Last modified:25 Apr 2024 01:22
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/76765
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