论文标题
抗铁磁体的旋转大厅效应
Spin Hall Effects in Antiferromagnets
论文作者
论文摘要
最近的实验表明，抗铁磁铁表现出自旋霍尔效应。我们研究了带有Rashba旋转轨道耦合和混乱的正方形晶格上的抗铁磁铁的紧密结合模型。通过将有限系统的对角度确切连接到Landauer-B $ \ ddot {\ text {u}} $ ttiker形式主义中的储层，我们根据纵向伏特的差异来计算横向旋转大厅电流。令人惊讶的是，在抗铁磁铁中，自旋大厅的电导比正常金属可能大得多。我们将我们的结果与肿瘤配方中固有贡献控制的浆果相诱导的自旋霍尔效应进行了比较。浆果相诱导的固有自旋霍尔电导率显示了相反的行为：AFS中的大型交换耦合大大降低了自旋大厅电流。
Recent experiments demonstrate that antiferromagnets exhibit the spin Hall effect. We study a tight-binding model of an antiferromagnet on a square lattice with Rashba spin-orbit coupling and disorder. By exact diagonalization of a finite system connected to reservoirs within the Landauer-B$\ddot{\text{u}}$ttiker formalism, we compute the transverse spin Hall current in response to a longitudinal voltage difference. Surprisingly, the spin Hall conductance can be considerably larger in antiferromagnets than in normal metals. We compare our results to the Berry-phase-induced spin Hall effect governed by the intrinsic contribution in the Kubo formula. The Berry-phase-induced intrinsic spin Hall conductivity in bulk systems shows the opposite behavior: large exchange couplings in AFs drastically reduce the spin Hall current.
