A quantitative comparison of time-of-flight momentum microscopes and hemispherical analyzers for time- and angle-resolved photoemission spectroscopy experiments
A quantitative comparison of time-of-flight momentum microscopes and hemispherical analyzers for time- and angle-resolved photoemission spectroscopy experiments
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DOI：
10.1063/5.0024493
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发表时间：
2020-12-01
影响因子：
1.6
通讯作者：
Rettig, L.
中科院分区：
文献类型：
--
作者：
Maklar, J.;Dong, S.;Rettig, L.
基于飞行时间的动量显微镜在光电子研究中的应用越来越广泛，因为它能够并行获取完整的光电子分布的能量和动量分辨数据。在这里，我们报告了台式极紫外时间和角度分辨光电子能谱 (trARPES)，在同一装置中配备了半球分析仪和动量显微镜。我们对两种检测方案进行了系统比较，并量化了实验相关参数，包括泵浦和探针引起的空间电荷效应、检测效率、光电子计数率和焦深。我们基于散装 WSe2 的示例性 trARPES 测量来强调这两种仪器的优点和局限性。我们的分析证明了两个光谱仪在时间分辨 ARPES 实验中的互补性。它们结合在一个实验装置中，使我们能够利用 trARPES 解决广泛的科学问题。
Time-of-flight-based momentum microscopy has a growing presence in photoemission studies, as it enables parallel energy- and momentum-resolved acquisition of the full photoelectron distribution. Here, we report table-top extreme ultraviolet time- and angle-resolved photoemission spectroscopy (trARPES) featuring both a hemispherical analyzer and a momentum microscope within the same setup. We present a systematic comparison of the two detection schemes and quantify experimentally relevant parameters, including pump- and probe-induced space-charge effects, detection efficiency, photoelectron count rates, and depth of focus. We highlight the advantages and limitations of both instruments based on exemplary trARPES measurements of bulk WSe2. Our analysis demonstrates the complementary nature of the two spectrometers for time-resolved ARPES experiments. Their combination in a single experimental apparatus allows us to address a broad range of scientific questions with trARPES.