论文标题
新型电子 - 音波耦合机制对二维材料中山谷物理的影响
Impact of novel electron-phonon coupling mechanisms on valley physics in two-dimensional materials
论文作者
论文摘要
我们系统地研究了各种电子声音 - 音波耦合机制对二维材料中山谷物理学的影响。在静态应变极限中，我们发现Dirac锥体倾斜和变形电位具有类似的山谷大厅的响应，因为它们属于伪源性结构的相同普遍性类别。但是，这种参数因依赖位置的费米速度的耦合机制而失败。对于各向同性的情况，显着的山谷大厅的效应接近与键长变化相似的电荷中性，而对于各向异性情况，几何山谷的传输被抑制，类似于变形电位。即使引入了菌株的动力学，也发现不均匀应变的间隙开口机理完全抑制了山谷大厅的运输。通过不同的门电压，可以实现可调式声子辅助的山谷大厅的响应，这铺平了一种通向丰富现象和山谷大声电的新功能的方法。
We systematically study the impact of various electron-acoustic-phonon coupling mechanisms on valley physics in two-dimensional materials. In the static strain limit, we find that Dirac cone tilt and deformation potential have analogous valley Hall response since they fall into the same universality class of pseudospin structure. However, such argument fails for the coupling mechanism with position-dependent Fermi velocity. For the isotropic case, a significant valley Hall effect occurs near charge neutrality similar to the bond-length change, whereas for the anisotropic case, the geometric valley transport is suppressed, akin to the deformation potential. Gap opening mechanism by nonuniform strain is found to totally inhibit the valley Hall transport, even if the dynamics of strains are introduced. By varying gate voltage, a tunable phonon-assisted valley Hall response can be realized, which paves a way toward rich phenomena and new functionalities of valley acoustoelectronics.
