Han Wei, Maekawa Sadamichi, Xie Xin-Cheng
International Center for Quantum Materials, School of Physics, Peking University, Beijing, China.
Collaborative Innovation Center of Quantum Matter, Beijing, China.
Nat Mater. 2020 Feb;19(2):139-152. doi: 10.1038/s41563-019-0456-7. Epub 2019 Aug 26.
Spin current historically referred to the flow of electrons carrying spin information, in particular since the discovery of giant magnetoresistance in the 1980s. Recently, it has been found that spin current can also be mediated by spin-triplet supercurrent, superconducting quasiparticles, spinons, magnons, spin superfluidity and so on. Here, we review key progress concerning the developing research direction utilizing spin current as a probe of quantum materials. We focus on spin-triplet superconductivity and spin dynamics in the ferromagnet/superconductor heterostructures, quantum spin liquids, magnetic phase transitions, magnon-polarons, magnon-polaritons, magnon Bose-Einstein condensates and spin superfluidity. The unique characteristics of spin current as a probe will be fruitful for future investigation of spin-dependent properties and the identification of new quantum materials.
自旋流在历史上指携带自旋信息的电子流，特别是自20世纪80年代巨磁阻被发现以来。最近，人们发现自旋流也可以由自旋三重态超流、超导准粒子、自旋子、磁振子、自旋超流性等介导。在这里，我们回顾了利用自旋流作为量子材料探针这一研究方向的关键进展。我们重点关注铁磁体/超导体异质结构中的自旋三重态超导性和自旋动力学、量子自旋液体、磁相变、磁振子极化子、磁振子极化激元、磁振子玻色-爱因斯坦凝聚体和自旋超流性。自旋流作为探针的独特特性将为未来自旋相关性质的研究和新型量子材料的识别带来丰硕成果。
