Supercurrent-induced skyrmion dynamics and tunable Weyl points in chiral magnet with superconductivity
Supercurrent-induced skyrmion dynamics and tunable Weyl points in chiral magnet with superconductivity
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DOI：
10.1103/physrevb.94.235117
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发表时间：
2016-07
影响因子：
3.7
通讯作者：
R. Takashima;S. Fujimoto
中科院分区：
文献类型：
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作者：
R. Takashima;S. Fujimoto
最近的研究表明，超导性为自旋电子学提供了新的视角。我们研究了由s波超导体和立方手征磁体组成的异质结构，它可以稳定拓扑自旋织构，即skyrmion。我们提出了一个超导引起的自旋力矩，起源于自旋轨道耦合，我们表明，自旋力矩可以驱动一个skyrmion在一个有效的方式，减少焦耳加热。我们还研究了Bogoliubov准粒子的能带结构，并显示了Weyl点的存在，其位置可以由磁化方向控制。这导致在自旋织构存在下，有效磁场作用于准粒子。此外，外尔锥的倾斜也可以通过自旋轨道耦合的强度来调节，我们提出了一种可能的实现II型外尔点。
Recent studies show superconductivity provides new perspectives on spintronics. We study a heterostructure composed of an s-wave superconductor and a cubic chiral-magnet that can stabilize a topological spin texture, a skyrmion. We propose a supercurrent-induced spin torque that originates from the spin-orbit coupling, and we show that the spin torque can drive a skyrmion in an efficient way that reduces Joule heating. We also study the band structure of Bogoliubov quasiparticles and show the existence of Weyl points, whose positions can be controlled by the direction of the magnetization. This results in an effective magnetic field acting on the quasiparticles in the presence spin textures. Furthermore, the tilt of the Weyl cones can also be tuned by the strength of the spin-orbit coupling, and we propose a possible realization of type-II Weyl points.