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arXiv 1606.07680cond-mat.mes-hallcond-mat.mtrl-sci
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外磁场对铁磁体费米面的操纵

Fermi surface manipulation by external magnetic field demonstrated for a prototypical ferromagnet

E. Młyńczak, M. Eschbach, S. Borek, J. Minár, J. Braun, I. Aguilera, G. Bihlmayer, S. Döring, M. Gehlmann, P. Gospodarič, S. Suga, L. Plucinski, S. Blügel, H. E… 展开作者

E. Młyńczak, M. Eschbach, S. Borek, J. Minár, J. Braun, I. Aguilera, G. Bihlmayer, S. Döring, M. Gehlmann, P. Gospodarič, S. Suga, L. Plucinski, S. Blügel, H. Ebert, C. M. Schneider

摘要:

我们考虑了铁磁体Fe(001)的近表面电子能带结构的细节。利用高分辨率角分辨光电子能谱,我们证明了自旋轨道诱导的费米能级附近的电子带隙的开口。带隙和费米面可以通过改变反向磁化方向来控制。该效应的量级为$Δ$ E = 100 meV和$Δ\text {k} = 0.1\,\textÅ^{-1}$。我们发现,所观察到的分散体占主导地位的散装能带结构。第一性原理计算和一步光电发射计算表明,这种效应与电子基态的变化有关,而不是由光电发射过程本身引起的.这种效应的对称性表明,所观察到的电子体态受到表面存在的影响,这可能被理解为与拉什巴型效应有关。通过精确定位电子能带结构中出现可切换带隙的区域,我们证明了自旋-轨道相互作用的重要性,即使对于像3d铁磁体这样轻的元素。

英文摘要:

We consider the details of the near-surface electronic band structure of a prototypical ferromagnet, Fe(001). Using high resolution angle-resolved photoemission spectroscopy we demonstrate openings of the spin-orbit induced electronic band gaps near the Fermi level. The band gaps and thus the Fermi surface can be manipulated by changing the remanent magnetization direction. The effect is of the order of $Δ$E = 100 meV and $Δ\text {k} = 0.1\,\textÅ^{-1}$. We show that the observed dispersions are dominated by the bulk band structure. First-principles calculations and one-step photoemission calculations suggest that the effect is related to changes in the electronic ground state, rather than caused by the photoemission process itself. The symmetry of the effect indicates that the observed electronic bulk states are influenced by the presence of the surface, which might be understood as related to a Rashba-type effect. By pinpointing the regions in the electronic band structure where the switchable band gaps occur, we demonstrate the significance of spin-orbit interaction even for elements as light as 3d ferromagnets.

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