KTaO $_3$中的动态感生磁性
Dynamically induced magnetism in KTaO$_3$
摘要：
动态多铁性的特征纠缠动态订单：波动的电偶极子诱导磁化。因此，具有顺电波动的材料如果被动态驱动，则可以产生磁性特征。我们确定的顺电KTaO $_3$（KTO）作为一个主要的候选人的动态多铁性的观察。当KTO样品暴露于圆偏振激光脉冲时，动态诱导的离子磁矩约为每个晶胞核磁子的5%.我们确定的声子谱使用从头计算方法和识别T $_{1u}$作为相关的软声子模式，耦合到外部场和诱导的磁极化。我们还预测了相应的电子效应的动态诱导的磁矩，这是增强了几个数量级，由于电子和离子核之间的显着质量差。
英文摘要：
Dynamical multiferroicity features entangled dynamic orders: fluctuating electric dipoles induce magnetization. Hence, the material with paraelectric fluctuations can develop magnetic signatures if dynamically driven. We identify the paraelectric KTaO$_3$ (KTO) as a prime candidate for the observation of the dynamical multiferroicity. We show that when a KTO sample is exposed to a circularly polarized laser pulse, the dynamically induced ionic magnetic moments are of the order of 5\% of the nuclear magneton per unit cell. We determine the phonon spectrum using ab initio methods and identify T$_{1u}$ as relevant soft phonon modes that couple to the external field and induce magnetic polarization. We also predict a corresponding electron effect for the dynamically induced magnetic moment which is enhanced by several orders of magnitude due to the significant mass difference between electron and ionic nucleus.
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