Lightwave valleytronics in a monolayer of tungsten diselenide.
Lightwave valleytronics in a monolayer of tungsten diselenide.
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DOI：
10.1038/s41586-018-0013-6
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发表时间：
2018-05
期刊：
影响因子：
64.8
通讯作者：
Huber R
中科院分区：
文献类型：
--
作者：
Langer F;Schmid CP;Schlauderer S;Gmitra M;Fabian J;Nagler P;Schüller C;Korn T;Hawkins PG;Steiner JT;Huttner U;Koch SW;Kira M;Huber R
随着传统电子学接近其极限，纳米科学迫切需要在基本量子水平上寻找新的电子快速控制概念。光波电子学-阿秒科学的基础-利用强光脉冲的振荡载波来控制电子电荷的平移运动，其速度比光的单个周期更快。尽管是特别有前途的信息载体，自旋和谷赝自旋的内部量子属性还没有在子周期尺度上切换。在这里，我们展示了光波驱动的谷赝自旋的变化，并引入不同的签名在光学读出。在二硒化钨单分子层中，光生电子-空穴对被强光波加速并碰撞。高奇阶边带的出现及其极化方向的异常变化直接证明了超快赝自旋动力学。结合密度泛函理论与非微扰量子多体方法的定量计算分配的边带的偏振的光波引起的变化的谷赝自旋，并确认该过程是相干的和绝热的。我们的工作打开了大门，系统valleytronic逻辑在光学时钟速率。
As conventional electronics is approaching its ultimate limits, nanoscience has urgently sought for novel fast control concepts of electrons at the fundamental quantum level. Lightwave electronics – the foundation of attosecond science – utilizes the oscillating carrier wave of intense light pulses to control the translational motion of the electron’s charge faster than a single cycle of light. Despite being particularly promising information carriers, the internal quantum attributes of spin and valley pseudospin have not been switchable on the subcycle scale. Here we demonstrate lightwave-driven changes of the valley pseudospin and introduce distinct signatures in the optical read out. Photogenerated electron–hole pairs in a monolayer of tungsten diselenide are accelerated and collided by a strong lightwave. The emergence of high odd-order sidebands and anomalous changes in their polarization direction directly attest to the ultrafast pseudospin dynamics. Quantitative computations combining density-functional theory with a non-perturbative quantum many-body approach assign the polarization of the sidebands to a lightwave-induced change of the valley pseudospin and confirm that the process is coherent and adiabatic. Our work opens the door to systematic valleytronic logic at optical clock rates.
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通讯作者：
Huber, R.