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Magnetism, transport, and thermodynamics in two-dimensional half-filled Hubbard superlattices

机译:二维半填充哈伯德超晶格中的磁性,输运和热力学

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摘要

We study magnetic, transport, and thermodynamic properties of the half-filled two-dimensional (2D) Hubbard model with layered distributed repulsive interactions using unbiased finite temperature quantum Monte Carlo simulations. Antiferromagnetic long-ranged correlations at T = 0 are confirmed by means of the magnetic structure factor and the onset of short-ranged ones is at a minimum temperature, which can be obtained by peaks in susceptibility and specific heat following a random-phase-approximation (RPA) prediction. We also show that transport is affected in the large interaction limit and is enhanced in the nonrepulsive layers suggesting a change of dimensionality induced by increased interactions. Lastly, we show that by adiabatically switching the interactions in layered distributed patterns reduces the overall temperature of the system with a potential application in cooling protocols in cold atoms systems.
机译:我们使用无偏有限温度量子蒙特卡洛模拟研究具有分层分布的排斥相互作用的半填充二维(2D)哈伯德模型的磁,输运和热力学性质。通过磁结构因子确定T = 0处的反铁磁长程相关性,而短程中的短程相关性是在最低温度下发生的,这可以通过在随机相近似之后的磁化率和比热峰值来获得(RPA)预测。我们还显示,运输在较大的相互作用极限中受到影响,并且在非排斥层中增强,表明相互作用增加引起的尺寸变化。最后,我们显示出通过绝热地切换分层分布模式中的相互作用,可以降低系统的整体温度,并有可能在冷原子系统的冷却协议中应用。

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  • 来源
    《Physical review》 |2017年第7期|075142.1-075142.13|共13页
  • 作者

    Rubem Mondaini; Thereza Paiva;

  • 作者单位

    Beijing Computational Science Research Center, Beijing 100193, China;

    Instituto de Física, Universidade Federal do Rio de Janeiro, Cx.P. 68.528, 21941-972 Rio de Janeiro, RJ, Brazil;

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