论文标题
电子载体互动的热载体辅助交换1 $ t $ -VSE $ _2 $
Hot carrier-assisted switching of the electron-phonon interaction in 1$T$-VSe$_2$
论文作者
论文摘要
我们应用强烈的红外激光脉冲，以在三维电荷密度波材料中扰动电子和振动状态1 $ t $ -vse $ _2 $。使用时间和角度分辨光谱光谱法收集了光诱导的热载体动力学和非平衡准粒子光谱功能的超快快照。热载体温度和时间依赖性电子能源是从时间依赖的光谱函数中提取的，这表明不连贯的电子 - phonon相互作用加热了在$（200 \ pm 40）$ 〜fs上电荷密度波临界温度上方的晶格。密度功能扰动理论的计算表明，热载体的存在改变了整体声子分散并淬灭有效的低能声音声子散射通道，从而导致新的准平衡状态在实验上观察到。
We apply an intense infrared laser pulse in order to perturb the electronic and vibrational states in the three-dimensional charge density wave material 1$T$-VSe$_2$. Ultrafast snapshots of the light-induced hot carrier dynamics and non-equilibrium quasiparticle spectral function are collected using time- and angle-resolved photoemission spectroscopy. The hot carrier temperature and time-dependent electronic self-energy are extracted from the time-dependent spectral function, revealing that incoherent electron-phonon interactions heat the lattice above the charge density wave critical temperature on a timescale of $(200 \pm 40)$~fs. Density functional perturbation theory calculations establish that the presence of hot carriers alters the overall phonon dispersion and quenches efficient low-energy acoustic phonon scattering channels, which results in a new quasi-equilibrium state that is experimentally observed.
