论文标题
手性声子与2D材料中的伪动量纠缠在一起的多个大厅效应和统一的惯例
Chiral phonons entangled with multiple Hall effects and unified convention for pseudoangular momentum in 2D materials
论文作者
论文摘要
最近，提出了一系列具有相似晶体结构的二维（2D）非磁性分层材料XSI2Y4（X =过渡金属； Y = Pnictogens）具有相似的晶体结构，并提出了过渡金属二甲硅烷基（TMDS）的势值。像TMD一样，我们建议还可以在XSI2Y4中获得涉及山谷选择性的光学圆二色性二色性的手性声子，并且可以与多个大厅的效应纠缠在一起。但是，由于先前的研究中伪角动量（PAM）的未统一约定，很难比较XSI2Y4和TMD之间的这种影响。在这里，我们使用MOSI2AS4和MOS2作为示例来为声子PAM和电子PAM建立统一的惯例，并显示出它们在晶体结构，带结构和山谷选择性的光学圆形二科运动方面的相似性和差异。特别是，我们可以通过改变入射光的能量或触角的能量或手持性来调节MOSI2AS4，手性声子发射/吸收，自旋，山谷和横向大厅电流，这表现出比TMD更好的性能。
Recently, a series of two-dimensional (2D) nonmagnetic layered materials XSi2Y4 (X=transition metals; Y=pnictogens) having similar crystal structures with transition-metal dichalcogenides (TMDs) were proposed for their potential application value. Like TMDs, we propose that chiral phonon involved valley-selective optical circular dichroism can be also obtained in XSi2Y4, and it can be further entangled with multiple Hall effects. However, it is difficult to compare such effect between XSi2Y4 and TMDs due to the non-unified conventions for pseudo-angular momentum (PAM) in the previous studies. Here we use MoSi2As4 and MoS2 as examples to establish unified convention for both phonon PAM and electronic PAM, together with showing their similarities and differences in crystal structure, band structures and valley-selective optical circular dichroism. In particular, we find in MoSi2As4, the chiral phonon emission/absorption, the spin, the valley and the transverse Hall current, can be modulated by changing either the energy or the handedness of the incident light, which show better performance than TMDs.
