Photon-modulated linear and nonlinear anomalous Hall effects in type-II semi-Dirac semimetals
Photon-modulated linear and nonlinear anomalous Hall effects in type-II semi-Dirac semimetals
复制标题
II 型半狄拉克半金属中的光子调制线性和非线性反常霍尔效应
DOI：
10.1103/physrevb.105.085124
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发表时间：
2022
影响因子：
3.7
通讯作者：
Rui-Qiang Wang
中科院分区：
文献类型：
--
作者：
Jin-Na Chen;Yan-Yan Yang;Yong-Long Zhou;Yong-Jia Wu;Hou-Jian Duan;Ming-Xun Deng;Rui-Qiang Wang
二维半狄拉克材料在一个方向上具有二次色散，在正交方向上具有线性色散，为在固体中形成陈绝缘态提供了一种途径。在Floquet理论的框架内，我们研究了II型半狄拉克半金属中的光子调制线性和非线性反常霍尔效应（AHE），发现丰富的拓扑相以及与拓扑转变相关的有趣现象可以通过圆偏振光（CPL）实现和操纵。通过调整CPL参数，我们可以独立控制局部倒置间隙，并选择性地在不同拓扑相之间切换系统。我们还证明，当费米能级位于能隙之外时，由于电子结构的各向异性，电导率的德鲁德分量也可以对 AHE 做出贡献。此外，当相对谷之间的反演对称性被打破时，可以观察到由贝里曲率偶极子引起的非线性霍尔效应。我们的发现有助于理解新兴的 II 型半狄拉克半金属的拓扑性质。
Two-dimensional semi-Dirac materials, with quadratic dispersion in one direction and linear dispersion in the orthogonal direction, provide a route to formation of the Chern-insulating states in solids. Within the framework of the Floquet theory, we investigate the photon-modulated linear and nonlinear anomalous Hall effect (AHE) in type-II semi-Dirac semimetals and find that rich topological phases, as well as interesting phenomena related to the topological transitions, can be realized and manipulated by circularly polarized light (CPL). By tuning the CPL parameters, we can control the local inverted gaps independently and switch the system between different topological phases optionally. We also demonstrate that, when the Fermi level locates outside the gap, the Drude component of the conductivity can contribute to the AHE as well, because of the anisotropy of the electronic structure. Besides, the nonlinear Hall effect due to the Berry curvature dipole can be observable when the inversion symmetry between opposite valleys is broken. Our findings are helpful to understand the topological properties of the emergent type-II semi-Dirac semimetals.