标题： 近红外激光脉冲的动量势中的动量转移导致时间分辨ARPES中的显著能量偏移和电子波包压缩 显示英文标题

标题： Momentum transfer in the ponderomotive potential of near-infrared laser pulses leads to sizable energy shifts and electron-wavepacket squeezing in time-resolved ARPES

摘要： 我们在近红外(NIR)激光脉冲的辐射压势中观察到了动量转移，在使用超短极紫外探测脉冲的时间和角度分辨光电子能谱(tr-ARPES)实验中。由在表面上反射的强激光脉冲提供的瞬态光栅加速光电子，导致电动能的延迟依赖振荡。光子和电子动量决定了振荡频率。我们实验观察并理论模拟了由一种新的电子能量聚束效应驱动的电子产率调制。测量结果被高精度地模拟和拟合。辐射压动量转移的完全逆转使得能够获取重叠泵浦和探测脉冲下未受干扰的初始状态和瞬态能带结构。 显示英文摘要

摘要： We observe momentum transfer in the ponderomotive potential of near-infrared (NIR) laser pulses in time- and angle-resolved photoemission spectroscopy (tr-ARPES) experiments with ultrashort extreme ultraviolet probe pulses. Acceleration of photoelectrons in the transient grating provided by an intense laser pulse reflected at a surface leads to delay-dependent oscillations of electric kinetic energies. Photon and electron momenta determine the oscillation frequency. We experimentally observe and theoretically simulate electron yield modulations driven by a novel electron-energy bunching effect. Measurement results are simulated and fitted with high accuracy. Complete reversion of the ponderomotive momentum transfer allows for retrieval of the undisturbed initial state and the transient band structure for overlapping pump and probe pulses.