基于阿秒光电子谱研究金属光电子色散关系  

Metal Electron Dispersion by Attosecond Photoelectron Spectroscopy

作　　者：潘子萌 刘凯[1] 马子琦 廖青 PAN Zimeng;LIU Kai;MA Ziqi;LIAO Qing(School of Optical Information and Energy Engineering,Wuhan Institute of Technology,Wuhan 430205,China)

机构地区：[1]武汉工程大学光电信息与能源工程学院,湖北武汉430205

出　　处：《武汉工程大学学报》2022年第3期315-319,共5页Journal of Wuhan Institute of Technology

基　　金：湖北省自然科学基金(2020CFA082)。

摘　　要：为更加准确揭示单晶金属中光电子输运时间与可观测的光发射时间之间的尺度关系,采用周期性势阱来描述光电子在金属内部的势能。通过量子力学数值计算得到光电子频谱图,观察从模拟得到的阿秒光电子谱图中提取的光电子发射时间与势阱深度及穿越金属厚度的关系,得出光电子输运时间随穿越金属厚度变化是非线性的,势阱深度由-10 eV减小到-5 eV时,非线性更加显著。结果验证了金属内部能量—动量关系强烈依赖于金属势能的具体形式。To accurately reveal a scaling relation between the photoelectron transport time and the observable photoemission time in the single-crystal metals,a periodic potential well was employed to represent the potentials of photoelectrons inside metals.The photoelectron spectrogram was obtained by numerical calculation of quantum mechanics,and the functional relation between the photoemission time extracted from attosecond photoelectron spectrogram and the potential well depth and transported metal thickness was obtained.The variation of photoelectron transport time with metal thickness is nonlinear.When the potential well depth reduces from-10 eV to-5 eV,the nonlinearity is more significant.The results verify that the energy-momentum relation inside the metal strongly depends on the specific form of the metal potential energy.

关 键 词：阿秒 光发射时间 光电子频谱图 周期势 

分 类 号：O437[机械工程—光学工程]