论文标题
由于半球形电容器被球形拓扑壳壳包围的磁电效应
The magnetoelectric effect due to a semispherical capacitor surrounded by a spherical topologically insulating shell
论文作者
论文摘要
我们考虑由两个半球形完美导电的板形成的电容器产生的磁电效应，该板受电势差，并被拓扑绝缘材料的球形壳包围。修改后的麦克斯韦方程是使用球形坐标和近似值的耦合电量表势来求解的，在近似中，有效的磁电耦合符合精细结构常数的顺序。重点放在磁场的计算中，用于几种相关配置，旨在增强测量该场的可能性。我们获得的幅度落在磁力仪以及使用扫描squid磁力测定法的氮气呈中心以及设备中的磁力计的灵敏度之内。
We consider the magnetoelectric effect produced by a capacitor formed by two semispherical perfectly conducting plates subjected to a potential difference and surrounded by a spherical shell of a topologically insulating material. The modified Maxwell equations are solved in terms of coupled electric and magnetic scalar potentials using spherical coordinates and in the approximation where the effective magnetoelectric coupling is of the order of the fine structure constant. The emphasis is placed in the calculation of the magnetic field for several relevant configurations designed to enhance the possibility of measuring this field. The magnitudes we obtain fall within the sensitivities of magnetometers based upon nitrogen-vacancy centers in diamond as well as of devices using scanning SQUID magnetometry.
