论文标题
亚周期谷化：使用几个线性极化脉冲对山谷极化的控制
Sub-cycle valleytronics: control of valley polarization using few-cycle linearly polarized pulses
论文作者
论文摘要
到目前为止，在六边形二维材料的布里鲁因区域中对所需山谷的选择性激发已依赖于使用圆形极化场。从理论上讲，我们展示了一种使用几个循环的，线性极化的脉冲具有控制的载体 - Envelope阶段的六边形时间尺度上诱导，控制和读取山谷极化的方法。山谷假蛋白是在发射脉冲的高谐波的螺旋性中编码的，从而避免了额外的探测脉冲，并允许一个步骤诱导，操纵和读取山谷伪词。谐波发射的高圆形提供了一种在全稳态的设置中以线性极化驱动器生成高椭圆形的脉冲的方法。
So far, selective excitation of a desired valley in the Brillouin zone of a hexagonal two-dimensional material has relied on using circularly polarized fields. We theoretically demonstrate a way to induce, control, and read valley polarization in hexagonal 2D materials on a few-femtosecond timescale using a few-cycle, linearly polarized pulse with controlled carrier-envelope phase. The valley pseudospin is encoded in the helicity of the emitted high harmonics of the driving pulse, allowing one to avoid additional probe pulses and permitting one to induce, manipulate and read the valley pseudospin all-optically, in one step. High circularity of the harmonic emission offers a method to generate highly elliptic attosecond pulses with a linearly polarized driver, in an all-solid-state setup.
