Time-resolved ARPES with probe energy of 6.0/7.2 eV and switchable resolution configuration

• Main Authors: Pan, Mojun, Liu, Junde, Chen, Famin, Wang, Ji, Yun, ChenXia, Qian, Tian
• Format: Journal Article
• Language: English
• Published: 12-10-2023
• Subjects: Physics - Mesoscale and Nanoscale Physics
• DOI: 10.48550/arxiv.2310.08028

We present a detailed exposition of the design for time- and angle-resolved
photoemission spectroscopy using a UV probe laser source that combines the
nonlinear effects of \b{eta}-BaB2O4 and KBe2BO3F2 optical crystals. The photon
energy of the probe laser can be switched between 6.0 and 7.2 eV, with the
flexibility to operate each photon energy setting under two distinct resolution
configurations. Under the fully optimized energy resolution configuration, we
achieve an energy resolution of 8.5 meV at 6.0 eV and 10 meV at 7.2 eV.
Alternatively, switching to the other configuration enhances temporal
resolution, yielding a temporal resolution of 72 fs for 6.0 eV and 185 fs for
7.2 eV. We validated the performance and reliability of our system by applying
it to measuring two typical materials: the topological insulator MnBi2Te4 and
excitonic insulator candidate Ta2NiSe5.