The strong fields associated with few-cycle pulses can drive highly nonlinear phenomena, allowing the direct control of electrons in condensed matter systems. In this context, by employing near-infrared single-cycle pulse pairs, we measure interferometric autocorrelations of the ultrafast currents induced by optical field emission at the nanogap of a single plasmonic nanocircuit. The dynamics of this ultrafast electron nanotransport depends on the precise temporal field profile of the optical driving pulse. Current autocorrelations are acquired with sub-femtosecond temporal resolution as a function of both pulse delay and absolute carrier-envelope phase. Quantitative modelling of the experiments enables us to monitor the spatiotemporal evolution of the electron density and currents induced in the system and to elucidate the physics underlying the electron transfer driven by strong optical fields in plasmonic gaps. Specifically, we clarify the interplay between the carrier-envelope phase of the driving pulse, plasmonic resonance and quiver motion.

与短周期脉冲相关的强场可以驱动高度非线性的现象，从而可以直接控制凝聚态系统中的电子。在这种情况下，通过采用近红外单周期脉冲对，我们可以测量由单等离子体纳米电路的纳米间隙处的光场发射引起的超快电流的干涉自相关。这种超快电子纳米传输的动力学取决于光学驱动脉冲的精确时间场轮廓。当前的自相关以亚飞秒时间分辨率作为脉冲延迟和绝对载波包络相位的函数来获取。实验的定量建模使我们能够监测系统中感应的电子密度和电流的时空演化，并阐明由等离激元间隙中的强光场驱动的电子传输的物理基础。具体来说，我们阐明了驱动脉冲的载流子-包络相，等离子体共振和颤动之间的相互作用。