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首页> 外文期刊>Physical review >Single magnetic impurity in a spin-imbalanced superfluid Fermi gas
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Single magnetic impurity in a spin-imbalanced superfluid Fermi gas

机译：自旋不平衡超流费米气体中的单一磁性杂质

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摘要

A spin-imbalanced superfluid Fermi gas harmonically trapped in a two-dimensional optical lattice with a single classical magnetic impurity is investigated by Bogoliubov-de Gennes equations. In both the spin-balanced and weak spin-imbalanced cases, we show that a strong magnetic impurity can change the sign of the pairing order parameter. The amplitude of the sign-changed order parameter caused by impurity is affected by the strength of the impurity potential, temperature, and particle density. Compared to the spin-balanced case, we find that an additional in-gap bound state can be induced by a strong magnetic impurity in the weak spin-imbalanced case. In the strong spin-imbalanced case where the Fulde-Ferrell-Larkin-Ovchinnikov state is established as the ground state, the impurity induces wide spatial oscillations of pairing order parameters and can enhance the order parameters by suppressing the local spin imbalance.
机译：通过Bogoliubov-de Gennes方程研究了自旋不平衡的超流体费米气体，该费米气体被谐波捕获在具有单个经典磁性杂质的二维光学晶格中。在自旋平衡和弱自旋不平衡的情况下，我们都表明强磁性杂质会改变配对顺序参数的符号。由杂质引起的符号改变阶数参数的幅度受杂质电势强度，温度和颗粒密度的影响。与自旋平衡的情况相比，我们发现在弱自旋不平衡的情况下，强磁性杂质会诱发额外的间隙内束缚态。在将Fulde-Ferrell-Larkin-Ovchinnikov状态确立为基态的强自旋不平衡情况下，杂质会引起配对顺序参数的宽空间振荡，并可以通过抑制局部自旋不平衡来增强顺序参数。

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  • 来源
    《Physical review》 |2012年第9期|p.094520.1-094520.9|共9页
  • 作者

    Jian Li; C. S. Ting;

  • 作者单位

    Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204, USA;

    Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    degenerate fermi gases; magnetic impurity interactions;

    机译：简并的费米气体磁性杂质相互作用;

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