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Performance of the spin-dependent Krieger-Li-Iafrate approximation in jellium slabs

机译:自旋相关的Krieger-Li-Iafrate近似在凝胶中的性能

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摘要

The possible spin-polarized states of metallic jellium slabs have been studied by means of a Krieger-Li-Iafrate (KLI) approximation for the exchange potential. The stability of the different magnetic states has been determined by using a fixed-spin-moment method. Notably, in the search for solutions with different magnetizations, the KLI approximation leads to the sudden filling of electronic states for either majority or minority spin channels, and also to hysteresis effects, as the system crosses these points of discontinuity. These effects are completely missed by the local spin-density approximation (LSDA), which exhibits instead a continuous behavior. Close to the density corresponding to the Bloch instability of the homogeneous 3D electron gas, different exotic magnetic configurations appear, some of them featuring a spontaneous breaking of inversion symmetry around the slab center. As compared to the LSDA, the spin-dependent KLI approximation offers a moderate increase of the stability of a slab antiferromagnetic state.
机译:借助于Krieger-Li-Iafrate(KLI)近似法研究了交换电位的金属胶坯的可能的自旋极化态。已经通过使用固定自旋矩方法确定了不同磁态的稳定性。值得注意的是,在寻找具有不同磁化强度的解决方案时,由于系统穿越了这些不连续点,因此KLI逼近会导致大多数或少数自旋通道的电子态突然填充,并导致磁滞效应。这些效应完全被局部自旋密度近似(LSDA)所忽略,而局部自旋密度近似却表现出连续的行为。接近与均匀3D电子气的布洛赫不稳定性对应的密度,出现了不同的奇异磁性结构,其中一些特征是围绕板坯中心自发地反转对称性。与LSDA相比,自旋相关的KLI近似值可适度增加平板反铁磁态的稳定性。

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  • 来源
    《Physical review》 |2019年第23期|235111.1-235111.12|共12页
  • 作者单位

    UNLP, CCT La Plata, CONICET, Inst Invest Fisicoquim Teor & Aplicadas INIFTA, Diagonal 113 & 64, La Plata, Buenos Aires, Argentina;

    Humboldt Univ, Inst Phys, D-12489 Berlin, Germany|Humboldt Univ, IRIS Adlershof, D-12489 Berlin, Germany;

    Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina|Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

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