arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1612.00366cond-mat.mes-hall
收藏

反铁磁体中磁振子的电驱动玻色-爱因斯坦凝聚

Electrically Driven Bose-Einstein Condensation of Magnons in Antiferromagnets

Eirik Løhaugen Fjærbu, Niklas Rohling, Arne Brataas

摘要:

我们探索了在绝缘反铁磁体中实现磁振子的电驱动玻色-爱因斯坦凝聚的途径。即使在绝缘的反铁磁体中,局域自旋也可以通过自旋转移矩和自旋泵激与相邻金属中的巡游自旋强耦合。我们描述了在相邻的正常金属中,由沿交错场极化的自旋积累控制的稳态磁振子凝聚的形成。反铁磁体中存在两种类型的磁振子,它们具有相反的磁矩。因此,与铁磁体相反,玻色-爱因斯坦凝聚可以发生在自旋积累的任一符号上。即使在室温下,当与正常金属的相互作用比反铁磁体内的弛豫过程快时,这种冷凝也可能发生。在反铁磁体中,凝聚体的工作频率比铁磁体快几个数量级。

英文摘要:

We explore routes to realize electrically driven Bose-Einstein condensation of magnons in insulating antiferromagnets. Even in insulating antiferromagnets, the localized spins can strongly couple to itinerant spins in adjacent metals via spin-transfer torque and spin pumping. We describe the formation of steady-state magnon condensates controlled by a spin accumulation polarized along the staggered field in an adjacent normal metal. Two types of magnons exist in antiferromagnets, which carry opposite magnetic moments. Consequently, and in contrast to ferromagnets, Bose-Einstein condensation can occur for either sign of the spin accumulation. This condensation may occur even at room temperature when the interaction with the normal metal is fast compared to the relaxation processes within the antiferromagnet. In antiferromagnets, the operating frequencies of the condensate are orders of magnitude faster than in ferromagnets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑