University of Illinois at Urbana-Champaign, Department of Electrical and Computer Engineering, Urbana, IL, 61801, USA.
University of Illinois at Urbana-Champaign, Micro and Nanotechnology Laboratory, Urbana, IL, 61801, USA.
Sci Rep. 2017 Jul 27;7(1):6736. doi: 10.1038/s41598-017-06965-8.
The realization of high-performance, small-footprint, on-chip inductors remains a challenge in radio-frequency and power microelectronics, where they perform vital energy transduction in filters and power converters. Modern planar inductors consist of metallic spirals that consume significant chip area, resulting in low inductance densities. We present a novel method for magnetic energy transduction that utilizes ferromagnetic islands (FIs) on the surface of a 3D time-reversal-invariant topological insulator (TI) to produce paradigmatically different inductors. Depending on the chemical potential, the FIs induce either an anomalous or quantum anomalous Hall effect in the topological surface states. These Hall effects direct current around the FIs, concentrating magnetic flux and producing a highly inductive device. Using a novel self-consistent simulation that couples AC non-equilibrium Green functions to fully electrodynamic solutions of Maxwell's equations, we demonstrate excellent inductance densities up to terahertz frequencies, thus harnessing the unique properties of topological materials for practical device applications.
在射频和电力微电子学中，实现高性能、小尺寸、片上电感器仍然是一个挑战，因为它们在滤波器和功率转换器中执行重要的能量转换。现代平面电感器由消耗大量芯片面积的金属螺旋线组成，导致电感密度低。我们提出了一种利用三维时间反演不变拓扑绝缘体（TI）表面的铁磁岛（FI）进行磁能转换的新方法，以产生明显不同的电感器。根据化学势，FI 在拓扑表面态中诱导出反常或量子反常霍尔效应。这些霍尔效应引导电流绕过 FI，集中磁通并产生高电感器件。使用一种新颖的自洽模拟方法，该方法将交流非平衡格林函数与麦克斯韦方程的全电动力学解耦合，我们在太赫兹频率范围内实现了出色的电感密度，从而利用拓扑材料的独特性质实现了实际的器件应用。
