论文标题
铁电get中的三点费物
Triple point fermions in ferroelectric GeTe
论文作者
论文摘要
由于存在三点和II型Weyl Fermions，因此揭露了铁电的Gete，以表现出电子带结构的多个多个非平凡的拓扑结构，这远远超出了先前报道的外部磁场控制的巨大Rashba旋转旋转。使用自旋和角度分辨的光发射光谱与从头算密度的功能理论结合使用，这是由一个自旋脱位的三重点周围的独特自旋纹理，并沿铁电晶体轴的两个自旋切换带被得出。这始终显示出与时间逆转对称性和Lorentz不变性相结合的旋转数字，发现在布里鲁因区域的两个三分对等相等。效果的丰富多种流形为研究凝结物质系统中的非平凡现象和多组分费米子提供了有希望的观点。
Ferroelectric GeTe is unveiled to exhibit an intriguing multiple non-trivial topology of the electronic band structure due to the existence of triple-point and type-II Weyl fermions, which goes well beyond the giant Rashba spin splitting controlled by external fields as previously reported. Using spin- and angle-resolved photoemission spectroscopy combined with ab initio density functional theory, the unique spin texture around the triple point caused by the crossing of one spin degenerate and two spin-split bands along the ferroelectric crystal axis is derived. This consistently reveals spin winding numbers that are coupled with time reversal symmetry and Lorentz invariance, which are found to be equal for both triple-point pairs in the Brillouin zone. The rich manifold of effects opens up promising perspectives for studying non-trivial phenomena and multi-component fermions in condensed matter systems.
