磁性拓扑绝缘体中的集体激发与轴子暗物质探测
Collective excitations in magnetic topological insulators and axion dark matter search
AI总结：
研究磁性拓扑绝缘体中的集体激发及其对轴子探测的影响，发现一种名为'轴子'的准粒子，其与电磁场的耦合强度可能显著改变利用磁性拓扑绝缘体进行轴子探测的灵敏度。
摘要：
研究磁性拓扑绝缘体中的集体激发及其对轴子探测的影响，在三维拓扑绝缘体模型中引入Hubbard项，通过动态磁化率推导出磁子和振幅模式的有效作用量。其中一种振幅模式被识别为'轴子'准粒子，其与电磁场的耦合强度发现与之前的估计相比基本保持不变，或被抑制了两个数量级，这可能显著改变利用'轴子'在磁性拓扑绝缘体中进行轴子探测的灵敏度。
英文摘要：
We investigate collective excitations in magnetic topological insulators (TIs) and their impact on axion detection. In the three-dimensional TI model with the Hubbard term, the effective action of magnons and amplitude modes is formulated by dynamical susceptibility under the antiferromagnetic and ferromagnetic states. One of the amplitude modes is identified as ``axionic'' quasi-particle and its effective coupling to the electromagnetic fields turns out to be roughly unchanged, or suppressed by up to two orders of magnitude, compared to the previous estimate, which may drastically change the sensitivity of the axion search using``axion' in magnetic TIs.
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