反铁磁隧道结中的自旋约瑟夫森效应
Spin-Josephson effect in antiferromagnetic tunnel junctions
摘要：
在约瑟夫森效应中，相干库珀对隧穿是由结两侧超导序参量之间的相位差驱动的。以此类推，结上的序参量的差异会导致对称性破缺状态下凝聚态物体的相干隧穿。为了展示这种现象的普遍性，并从一个现实的模型进行预测，我们研究了两个巡回反铁磁体之间的隧道结的情况。在平均场水平下，我们发现通过结的交错磁化的平衡电流与正常态电导和$\mathbf{S}_{L}\times \mathbf{S}_{R}$成比例，其中$\mathbf{S}_{L}$和$\mathbf{S}_{R}$是两侧的交错磁化。在微观上，这种效应来自于自旋为1电荷为0的粒子-空穴对的相干隧穿，这些粒子-空穴对的净波矢等于反铁磁波矢。我们解释了标准直流和交流约瑟夫森效应的相似性和差异。
英文摘要：
In the Josephson effect, coherent Cooper pair tunneling is driven by the phase difference between the superconducting order parameters on opposite sides of the junction. By analogy, differences in order parameters across a junction should lead to coherent tunneling of the condensed objects that exist in the broken symmetry state. To exhibit the generality of this phenomenon and make predictions from a realistic model, we study the case of a tunnel junction between two itinerant antiferromagnets. At the mean-field level, we find an equilibrium current of the staggered magnetization through the junction that is proportional the normal state conductance and to $\mathbf{S}_{L}\times \mathbf{S}_{R}$ where $\mathbf{S}_{L}$ and $\mathbf{S}_{R}$ are the staggered magnetizations on either sides. Microscopically, this effect comes from coherent tunneling of spin-one charge-zero particle-hole pairs that have a net wave vector equal to the antiferromagnetic one. We explain similarities and differences with the standard DC and AC Josephson effects.
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