论文标题
钨针尖的两色光发射中的量子干扰可见性光谱
Quantum interference visibility spectroscopy in two-color photoemission from tungsten needle tips
论文作者
论文摘要
当两色飞秒激光脉冲与物质相互作用时，可以通过各种多光子激发途径发射电子。这些途径之间的量子干扰会导致光仪电子电流的强振荡，从而实验以其可见性为特征。在这项工作中，我们展示了从固态纳米发电机中多光子光发射的两色可见性光谱。我们研究了基本飞秒激光脉冲及其第二谐波的量子途径干扰可见性。光发射显示高可见度为90％+/- 5％，分布非常恒定。此外，通过改变两种颜色的相对强度比，我们发现我们可以在0和接近100％之间改变可见性。一个简单但高度有见地的理论模型使我们能够通过出色的定量协议来解释所有观察结果。我们希望这项工作与各种光驱动的量子干扰有关，包括物理，化学和量子工程中的量子控制。
When two-color femtosecond laser pulses interact with matter, electrons can be emitted through various multiphoton excitation pathways. Quantum interference between these pathways gives rise to a strong oscillation of the photoemitted electron current, experimentally characterized by its visibility. In this work, we demonstrate two-color visibility spectroscopy of multi-photon photoemission from a solid-state nanoemitter. We investigate the quantum pathway interference visibility over an almost octave-spanning wavelength range of the fundamental femtosecond laser pulses and their second-harmonic. The photoemission shows a high visibility of 90% +/- 5%, with a remarkably constant distribution. Furthermore, by varying the relative intensity ratio of the two colors, we find that we can vary the visibility between 0 and close to 100%. A simple but highly insightful theoretical model allows us to explain all observations, with excellent quantitative agreements. We expect this work to be universal to all kinds of photo-driven quantum interference, including quantum control in physics, chemistry and quantum engineering.
