...
首页> 外文期刊>Physical review >Anisotropic surface-state-mediated RKKY interaction between adatoms
【24h】

Anisotropic surface-state-mediated RKKY interaction between adatoms

机译:各向异性表面状态介导的RKKY相互作用

获取原文
获取原文并翻译 | 示例
           

摘要

Motivated by recent numerical studies of Ag on Pt(111), we derive an expression for the RKKY interaction mediated by surface states, considering the effect of anisotropy in the Fermi edge. Our analysis is based on a stationary phase approximation. The main contribution to the interaction comes from electrons whose Fermi velocity vF is parallel to the vector R connecting the interacting adatoms; we show that, in general, the corresponding Fermi wave vector kf is not parallel to R. The interaction is oscillatory; the amplitude and wavelength of oscillations have angular dependence arising from the anisotropy of the surface-state band structure. The wavelength, in particular, is determined by the projection of this kF (corresponding to vF) onto the direction of R. Our analysis is easily generalized to other systems. For Ag on Pt(111), our results indicate that the RKKY interaction between pairs of adatoms should be nearly isotropic and so cannot account for the anisotropy found in the studies motivating our work. However, for metals with surface-state dispersions similar to Be(1010), we show that the RKKY interaction should have considerable anisotropy.
机译:受最近对Ag在Pt(111)上的数值研究的影响,考虑到费米边沿中各向异性的影响,我们推导了由表面态介导的RKKY相互作用的表达式。我们的分析基于平稳相位近似。对相互作用的主要贡献来自费米速度vF平行于连接相互作用的原子的矢量R的电子。我们证明,通常,相应的费米波矢量kf与R不平行。振荡的振幅和波长具有因表面态能带结构的各向异性而引起的角度依赖性。尤其是波长,由该kF(对应于vF)在R方向上的投影确定。我们的分析很容易推广到其他系统。对于Pt(111)上的Ag,我们的结果表明,成对吸附原子之间的RKKY相互作用应接近各向同性,因此不能解释激发我们工作的研究中发现的各向异性。但是,对于具有类似于Be(1010)的表面态色散的金属,我们表明RKKY相互作用应具有相当大的各向异性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号