Title: Ultrafast optically induced tunneling in narrow metallic gaps from the time dependent density functional perspective Show Chinese title

Title: 从时间依赖密度泛函的角度研究窄金属间隙中的超快光诱导隧穿效应

Abstract: In this work, using the time-dependent density functional theory, we address the electron tunneling triggered by short (single-cycle and several-cycle) optical pulses in narrow metallic gaps under conditions relevant for actual experiments. We identify photon-assisted tunneling with one-photon, two-photon, and higher-order photon absorption, and we discuss the effect of the tunneling barrier, applied bias, and strength of the optical field on transition from photon-assisted tunneling (weak optical fields) to the optical field emission at strong optical fields. The numerical single-electron calculations and an analytical strong-field theory model are used to gain deeper insights into the results of the time-dependent density functional theory calculations. Additionally, our parameter-free calculations allow us to retrieve and explain recent experimental results on optically induced transport in narrow metallic gaps under an applied dc bias. Show Chinese abstract

Abstract: 在本工作中，使用时间依赖密度泛函理论，我们研究了在实际实验相关条件下，由短（单周期和几个周期）光脉冲引发的窄金属间隙中的电子隧穿。 我们识别出与单光子、双光子和更高阶光子吸收相关的光子辅助隧穿，并讨论了隧穿势垒、施加的偏压和光场强度对从光子辅助隧穿（弱光场）到强光场下的光场发射的影响。 数值单电子计算和一种分析性强场理论模型被用来更深入地理解时间依赖密度泛函理论计算的结果。 此外，我们的无参数计算使我们能够检索并解释最近关于在施加直流偏压下窄金属间隙中光学诱导输运的实验结果。