Rashba-Dresselhaus金属中的多重$Q$磁序
Multiple-$Q$ magnetic orders in Rashba-Dresselhaus metals
摘要：
我们研究了非中心对称近藤晶格模型中实现的磁织构，其中局域磁矩与受Rashba和Dresselhaus自旋轨道耦合的巡游电子弱相互作用。借助最先进的数值模拟和变分计算，我们发现了零磁场下的多$Q$有序，这些有序起源于费米面的不稳定性，其自旋简并被自旋轨道耦合所提升.在Rashba和Dresselhaus自旋轨道耦合强度相等的情况下（已知这种耦合可以在半导体量子阱中实现持久的自旋螺旋），我们发现了六重-$Q$磁有序，具有棋盘状的空间模式。自旋标量手征性。在存在Rashba或Dresselhaus自旋轨道耦合的情况下，我们发现了另一种多重$Q$有序，它不同于在相同对称性下讨论的Skyrmion晶体。我们的结果表明，自旋-电荷耦合和自旋-轨道耦合的合作带来了更丰富的磁织构比在有效的自旋模型研究。这些情况将通过实验实现，例如，非中心对称重费米子化合物和自旋轨道耦合金属和磁性绝缘体的异质结构。
英文摘要：
We study magnetic textures realized in noncentrosymmetric Kondo lattice models, in which localized magnetic moments weakly interact with itinerant electrons subject to Rashba and Dresselhaus spin-orbit couplings. By virtue of state-of-the-art numerical simulations as well as variational calculations, we uncover versatile multiple-$Q$ orderings under zero magnetic field, which are found to originate in the instabilities of the Fermi surface whose spin degeneracy is lifted by the spin-orbit couplings. In the case with equally-strong Rashba and Dresselhaus spin-orbit couplings, which is known to realize a persistent spin helix in semiconductor quantum wells, we discover a sextuple-$Q$ magnetic ordering with a checkerboard-like spatial pattern of the spin scalar chirality. In the presence of either Rashba or Dresselhaus spin-orbit coupling, we find out another multiple-$Q$ ordering, which is distinct from Skyrmion crystals discussed under the same symmetry. Our results indicate that the cooperation of the spin-charge and spin-orbit couplings brings about richer magnetic textures than those studied within effective spin models. The situations would be experimentally realized, e.g., in noncentrosymmetric heavy-fermion compounds and heterostructures of spin-orbit coupled metals and magnetic insulators.
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