论文标题
掺杂的激光磁铁中纯自旋电流的出现
Emergence of pure spin current in doped excitonic magnets
论文作者
论文摘要
激子磁铁含有由传导波段电子和价频段孔组成的自旋三个激动子激素的冷凝物，可以通过两轨式哈伯德模型来描述。当哈密顿量具有最接近的邻里邻晶型跳跃积分时，具有$ d $ - 波的对称性，并且电子数量略微远离半填充时，$ \ boldsymbol {k} $ - 太空旋转质地在激子阶段出现，带有破碎的时间反向对称性。然后，我们表明，将电场沿特定方向应用到该掺杂的激光磁铁上，纯自旋电流沿其正交方向出现。我们讨论了实际材料中这种纯自旋电流的可能实现。
An excitonic magnet hosts a condensate of spin-triplet excitons composed of conduction-band electrons and valence-band holes, and may be described by the two-orbital Hubbard model. When the Hamiltonian has the nearest-neighbor interorbital hopping integrals with $d$-wave symmetry and the number of electrons is slightly away from half filling, the $\boldsymbol{k}$-space spin texture appears in the excitonic phase with a broken time-reversal symmetry. We then show that, applying electric field to this doped excitonic magnet along a particular direction, a pure spin current emerges along its orthogonal direction. We discuss possible experimental realization of this type of the pure spin current in actual materials.
