二维铁电双层WTe $_{2}$中具有大自旋分裂的可逆倾斜持续自旋织构
Reversible canted persistent spin textures with large spin splitting in two-dimensional ferroelectric bilayer WTe$_{2}$
摘要：
最近发现的材料托管持久自旋织构（PST）开辟了一条途径，实现节能自旋电子学，因为他们支持一个非常长的自旋寿命。然而，PST的稳定性是敏感的影响由外部扰动，如电场诱导的晶体的对称性破缺。本文通过第一性原理计算并辅以对称性分析，报道了在二维铁电双层WTe $_{2}$中出现的具有大自旋分裂的稳定的PST.由于晶体的低对称性（$C_{s}$点群），我们观察到一个倾斜的PST在费米能级周围的自旋分裂带显示沿$yz$平面在第一布里渊区的单向自旋配置倾斜。这种典型的PST可以通过沿面内方向的层间滑动引起的面外铁电开关来有效地反转。我们进一步证明了可逆PST是通过施加面外电场来实现的。因此，我们的研究结果揭示了二维材料中电可调PST的可能性，为高效自旋电子器件提供了一个有前途的平台。
英文摘要：
The recent discovery of materials hosting persistent spin texture (PST) opens an avenue for the realization of energy-saving spintronics since they support an extraordinarily long spin lifetime. However, the stability of the PST is sensitively affected by symmetry breaking of the crystal induced by external perturbation such as the electric field. In this paper, through first-principles calculations supplemented by symmetry analysis, we report the emergence of the robust and stable PST with large spin splitting in the two-dimensional ferroelectric bilayer WTe$_{2}$. Due to the low symmetry of the crystal ($C_{s}$ point group), we observe a canted PST in the spin-split bands around the Fermi level displaying a unidirectional spin configuration tilted along the $yz$ plane in the first Brillouin zone. Such a typical PST can be effectively reversed by out-of-plane ferroelectric switching induced by interlayer sliding along the in-plane direction. We further demonstrated that the reversible PST is realized by the application of an out-of-plane external electric field. Thus, our findings uncover the possibility of an electrically tunable PST in the 2D materials, offering a promising platform for highly efficient spintronics devices.
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