通过自旋霍尔效应控制磁振子玻色-爱因斯坦凝聚
Control of the Bose-Einstein Condensation of Magnons by the Spin-Hall Effect
AI总结：
本文证明利用自旋霍尔效应注入或湮灭磁振子可调控快速冷却诱导的磁振子玻色-爱因斯坦凝聚，阈值随电流极性变化-8%和+6%，为自旋电子器件中宏观量子态控制提供新方法。
摘要：
此前已有研究表明，对钇铁石榴石（YIG）/铂（Pt）纳米结构进行快速冷却——该结构预先由通过Pt层的电流加热——会导致磁振子气体过布居，并随后形成磁振子的玻色-爱因斯坦凝聚体（BEC）。自旋霍尔效应（SHE）在Pt层中产生自旋极化电流，根据电流和外加磁场方向的不同，可以注入或湮灭磁振子。在此我们证明，通过SHE注入或湮灭磁振子可以阻止或促进快速冷却诱导的磁振子BEC的形成。根据电流极性的不同，检测到BEC阈值分别发生了-8%和+6%的变化。这些发现展示了一种控制宏观量子态的新方法，为其在自旋电子器件中的应用铺平了道路。
英文摘要：
Previously, it has been shown that rapid cooling of yttrium-iron-garnet (YIG)/platinum (Pt) nano structures, preheated by an electric current sent through the Pt layer, leads to overpopulation of a magnon gas and to subsequent formation of a Bose-Einstein condensate (BEC) of magnons. The spin Hall effect (SHE), which creates a spin-polarized current in the Pt layer, can inject or annihilate magnons depending on the electric current and applied field orientations. Here we demonstrate that the injection or annihilation of magnons via the SHE can prevent or promote the formation of a rapid cooling induced magnon BEC. Depending on the current polarity, a change in the BEC threshold of -8% and +6% was detected. These findings demonstrate a new method to control macroscopic quantum states, paving the way for their application in spintronic devices.
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