Plasmonic quantum nonlinear Hall effect in noncentrosymmetric two-dimensional materials
Plasmonic quantum nonlinear Hall effect in noncentrosymmetric two-dimensional materials
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DOI：
10.1103/physrevb.106.l201301
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发表时间：
2022-11-04
影响因子：
3.7
通讯作者：
Kawakami，Norio
中科院分区：
文献类型：
--
作者：
Toshio，Riki;Kawakami，Norio
我们研究了量子几何效应和表面等离子体之间的相互作用，通过表面等离子体结构，基于电子流体力学理论。首先，我们证明了量子非线性霍尔效应可以显着增强在一个非常宽的频率范围内，通过利用等离子体共振和近场效应的光栅门。在共振条件下，增强变得比没有纳米结构的情况下大几个数量级，而高谐波等离子体激元的峰广泛扩展，并出现在非共振条件下，导致显着的宽光谱。此外，我们澄清的Berry曲率偶极子诱导的光电流和光吸收之间的普遍关系，这是必不可少的计算材料的长波长光电探测器的设计。接下来，我们讨论了一种新的机制的几何光电流，它起源于振荡磁场诱导的异常力，并描述了在动量空间中的布洛赫电子的轨道磁矩的偶极矩。我们的理论是相关的二维量子材料，如层状和扭曲的双层石墨烯，从而提供了一个有前途的路线走向一种新型的高灵敏度，宽带太赫兹光电探测器。
We investigate an interplay between quantum geometrical effects and surface plasmons through surface plasmonic structures, based on an electron hydrodynamic theory. First we demonstrate that the quantum nonlinear Hall effect can be dramatically enhanced over a very broad range of frequency by utilizing plasmonic resonances and near-field effects of grating gates. Under the resonant condition, the enhancement becomes several orders of magnitude larger than the case without the nanostructures, while the peaks of high-harmonic plasmons expand broadly and emerge under the off-resonant condition, leading to a remarkably broad spectrum. Furthermore, we clarify a universal relation between the photocurrent induced by the Berry curvature dipole and the optical absorption, which is essential for computational material design of long-wavelength photodetectors. Next we discuss a novel mechanism of geometrical photocurrent, which originates from an anomalous force induced by oscillating magnetic fields and is described by the dipole moment of orbital magnetic moments of Bloch electrons in the momentum space. Our theory is relevant to two-dimensional quantum materials such as layeredand twisted bilayer graphene, thereby providing a promising route toward a novel type of highly sensitive, broadband terahertz photodetector.