Strain engineering a persistent spin helix with infinite spin lifetime
Strain engineering a persistent spin helix with infinite spin lifetime
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DOI：
10.1103/physrevb.107.035155
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发表时间：
2022-08
影响因子：
3.7
通讯作者：
Xuezeng Lu;J. Rondinelli
中科院分区：
文献类型：
--
作者：
Xuezeng Lu;J. Rondinelli
固态材料中的持久自旋织构（PST）产生于动量空间中的单向自旋轨道场，并提供了一种为未来量子微电子器件提供长载流子自旋寿命的途径。尽管如此，由于晶体对称性和化学要求，很少有三维材料被称为PST宿主。实验证明的例子更少。在这里，我们报告说，高品质的持久自旋纹理可以在极点群包含奇数镜像操作。我们使用表示理论分析和电子结构计算来制定一般的发现原则，以确定隐藏在已知的复杂的三元层状和钙钛矿结构与大的电极化的PST。然后，我们展示了这些材料中的一些表现出PST，而不需要任何特殊的晶体对称性。这一发现消除了镜像对称保护的PST所施加的限制，限制了化合物的发现。我们的一般设计方法，使追求持久的自旋螺旋的材料表现出$C_{3v}$晶体类所采用的许多量子材料表现出大的Rashba系数。
Persistent spin textures (PSTs) in solid-state materials arise from a unidirectional spin-orbit field in momentum space and offer a route to deliver long carrier spin lifetimes sought for future quantum microelectronic devices. Nonetheless, few three-dimensional materials are known to host PSTs owing to crystal symmetry and chemical requirements. There are even fewer examples demonstrated experimentally. Here we report that high-quality persistent spin textures can be obtained in the polar point groups containing an odd number of mirror operations. We use representation theory analysis and electronic structure calculations to formulate general discovery principles to identify PSTs hidden in known complex ternary layered and perovskite structures with large electric polarizations. We then show some of these materials exhibit PSTs without requiring any special crystalline symmetries. This finding removes the limitation imposed by mirror-symmetry protected PSTs that has limited compound discovery. Our general design approach enables the pursuit of persistent spin helices in materials exhibiting the $C_{3v}$ crystal class adopted by many quantum materials exhibiting large Rashba coefficients.