Spin Supercurrent in the Canted Antiferromagnetic Phase
Spin Supercurrent in the Canted Antiferromagnetic Phase
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倾斜反铁磁相中的自旋超流
DOI：
10.1103/physrevb.87.104516
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发表时间：
2013
影响因子：
3.7
通讯作者：
Zyun. F. Ezawa
中科院分区：
文献类型：
--
作者：
Yusuke Hama;George Tsitsishvili;Zyun. F. Ezawa
自旋和层（伪自旋）自由度在双层量子霍尔系统的倾斜反铁磁相中在填充因子处相干纠缠。一个复杂的戈德斯通模式出现了，描述了这种组合自由度。在零隧穿相互作用极限（）下，其相场在每一层内激发出既携带自旋又携带电荷的超电流。预测霍尔阻力会变得异常，与逆流和阻力实验中的双层系统完全相同。进一步证明了在双层体系中流动的总电流是一种在逆流几何中只携带自旋的超电流。有趣的是，所有这些现象只发生在不平衡的双层系统中。
The spin and layer (pseudospin) degrees of freedom are entangled coherently in the canted antiferromagnetic phase of the bilayer quantum Hall system at the filling factor. A complex Goldstone mode emerges describing such a combined degree of freedom. In the zero tunneling-interaction limit (), its phase field provokes a supercurrent carrying both spin and charge within each layer. The Hall resistance is predicted to become anomalous precisely as in thebilayer system in the counterflow and drag experiments. Furthermore, it is shown that the total current flowing in the bilayer system is a supercurrent carrying solely spins in the counterflow geometry. It is intriguing that all these phenomena occur only in imbalanced bilayer systems.