论文标题
拓扑电磁学的电感和电容的出现
Emergence of inductance and capacitance from topological electromagnetism
论文作者
论文摘要
由于绝缘子中电子的非平凡动量空间拓扑而导致的拓扑电磁作用会导致各种异常磁电响应。虽然传统的电感器和电容器基于麦克斯韦方程所描述的经典电磁作用，但在这里我们表明，拓扑电磁与磁体中的自旋动力学结合使用也会产生电感或电容。我们建立一个通用框架，以拓扑场理论提取复杂的阻抗，并证明在几种异质结构设置中的电感或电容的出现。与金属磁体中先前研究的新兴电感相比，由于没有焦耳加热，绝缘子高度抑制了功率损耗。我们表明，拓扑电磁作用的电感是在低电流和高频下实现的，并且其功率效率也具有优势，其特征是高质量因子（Q-Factor）。
Topological electromagnetism owing to nontrivial momentum-space topology of electrons in insulators gives rise to diverse anomalous magnetoelectric responses. While conventional inductors and capacitors are based on classical electromagnetism described by Maxwell's equations, here we show that topological electromagnetism in combination with spin dynamics in magnets also generates an inductance or a capacitance. We build a generic framework to extract the complex impedance on the basis of topological field theory, and demonstrate the emergence of an inductance or a capacitance in several heterostructure setups. In comparison with the previously-studied emergent inductances in metallic magnets, insulators highly suppress the power loss, because of the absence of Joule heating. We show that the inductance from topological electromagnetism is achieved at low current and high frequency, and is also advantageous in its power efficiency, as characterized by the high quality factor (Q-factor).
