论文标题
可逆的倾斜持续旋转纹理，具有二维铁电biayer wte $ _ {2} $的大型旋转纹理
Reversible canted persistent spin textures with large spin splitting in two-dimensional ferroelectric bilayer WTe$_{2}$
论文作者
论文摘要
最近发现托管持续旋转质地（PST）的材料为实现节能旋转的途径开辟了一条途径，因为它们支持了非常长的旋转寿命。但是，PST的稳定性受到外部扰动（例如电场）诱导的晶体的对称破裂的敏感影响。在本文中，通过通过对称分析补充的第一原理计算，我们报告了稳定和稳定的PST的出现，并在二维铁电动双层中具有较大的自旋分裂WTE $ _ {2} $。由于水晶的对称性低（$ c_ {s} $ point组），我们在费米级附近的旋转频段中观察到一个倾斜的PST，在第一个Brillouin区域中沿着$ Yz $平面倾斜了单向旋转配置。这种典型的PST可以有效地通过沿着平面内方向滑动引起的平面外铁电开关来有效地逆转。我们进一步证明，可逆的PST是通过应用外部外部电场实现的。因此，我们的发现揭示了2D材料中电气可调PST的可能性，为高效的自旋设备提供了有前途的平台。
The recent discovery of materials hosting persistent spin texture (PST) opens an avenue for the realization of energy-saving spintronics since they support an extraordinarily long spin lifetime. However, the stability of the PST is sensitively affected by symmetry breaking of the crystal induced by external perturbation such as the electric field. In this paper, through first-principles calculations supplemented by symmetry analysis, we report the emergence of the robust and stable PST with large spin splitting in the two-dimensional ferroelectric bilayer WTe$_{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.
