标题： 由少周期光脉冲在石墨烯中产生和控制谷电流 显示英文标题

标题： Creation and control of valley currents in graphene by few cycle light pulses

摘要： 过渡金属二硫属化物家族可见光谱间隙的形成已经得到了很好的研究，谷电子学——通过光控制谷电荷和电流——对于表征石墨烯和拓扑绝缘体的太赫兹频段来说尚未被充分探索。 我们展示了一种由太赫兹光的几个周期脉冲可以在石墨烯中产生并控制100%的谷极化电流，同时通过对光波的调控实现对电流大小和方向的控制。 后者相当于几个周期圆偏振脉冲的一种新兴脉冲属性，即“全局”载波包络相位。 我们的发现不仅突显了几个周期光脉冲在量子物质控制中的丰富性，还为“太赫兹谷电子学”在毫电子伏特能隙系统中的发展提供了一条途径。 显示英文摘要

摘要： Well established for the visible spectrum gaps of the transition metal dichalcogenide family, valleytronics - the control of valley charge and current by light - is comparatively unexplored for the THz gaps that characterize graphene and topological insulators. Here we show that few cycle pulses of THz light can create and control a 100% valley polarized current in graphene, with light wave control over the current magnitude and direction. The latter is equal to an emergent pulse property of few cycle circularly polarized pulses, the "global" carrier envelope phase. Our findings both highlight the richness of few cycle light pulses in control over quantum matter, and provide a route towards a "THz valleytronics" in meV gapped systems.