Double layers (DLs) are nonlinear structures, and are thought to be responsible for particle acceleration in laboratory plasmas and astrophysical plasmas. In this paper, the existence of spin dependent DLs structure is explored using separate spin evolution quantum hydrodynamic model. Based on reductive perturbation method, we derived an extended Korteweg–de Vries (eKdV) equation to demonstrate the existence and nature of DLs. We found that spin polarization significantly enhanced the amplitude of the electrostatic potential associated with DLs. Further, spin polarization also increases the depth and width of the Sagdeev potential. It is noted that the contribution of Bohm potential effect is essential for the formation of DLs structure. Our results may be helpful to explain the phenomenon of particle acceleration in dense astrophysical environments specifically in a white dwarf.

中文翻译：

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关于天体物理等离子体中自旋相关双层结构的形成

双层 (DL) 是非线性结构，被认为是实验室等离子体和天体物理等离子体中粒子加速的原因。在本文中，使用单独的自旋演化量子流体动力学模型探索了自旋相关 DLs 结构的存在。基于还原微扰方法，我们推导出了扩展的 Korteweg-de Vries (eKdV) 方程来证明 DLs 的存在和性质。我们发现自旋极化显着增强了与 DL 相关的静电势的振幅。此外，自旋极化还增加了 Sagdeev 势的深度和宽度。注意到玻姆电位效应的贡献对于DLs结构的形成是必不可少的。