Previously, it has been shown that rapid cooling of yttrium-iron-garnet–platinum nanostructures, 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.

中文翻译：

---

通过自旋霍尔效应控制磁子的玻色-爱因斯坦凝聚

以前，已经表明，钇-铁-石榴石-铂纳米结构的快速冷却，由通过 Pt 层发送的电流预热，导致磁振子气体的过度填充，并随后形成玻色-爱因斯坦凝聚 (BEC)的 magnon。自旋霍尔效应 (SHE) 在 Pt 层中产生自旋极化电流，可以根据电流和施加的场方向注入或消灭磁振子。在这里，我们证明了通过 SHE 注入或消灭磁振子可以防止或促进快速冷却诱导的磁振子 BEC 的形成。根据电流极性，BEC 阈值的变化为$-8\%$ 和 $+6\%$被检测到。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。