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Angular-resolved photoelectron spectrometer (ARPES) has energy and momentum resolution capabilities, and is an important means of detecting the energy band structure of materials
.
With the development of ultrafast laser technology, the ultrafast angle-resolved photoelectron spectrometer (TR-ARPES) combined with pump-detection technology can be used to detect non-equilibrium electronic energy band information due to its time resolution capability.
Recently, Ding Hong's research group (EX7 group) doctoral students Chen Famin, Pan Mojun, and Liu Junde, under the guidance of researcher Qian Tian and deputy director engineer Yun Chenxia Next, the first domestic ultra-fast angle-resolved photoelectron spectrometer (HHG-TRARPES) based on high repetition rate and high-throughput high-order harmonic light source was developed and passed the field test (Figure 1)
.
The instrument system equipped with the six-axis sample stage low temperature, DA30 hemispherical analyzer, the ultimate vacuum better than 10 -10 Torr or, less than the lowest temperature.
-10 11 2 3 2
The research work is supported by the Beijing Municipal Commission of Science and Technology, the National Natural Science Foundation of China, the Chinese Academy of Sciences Strategic Pilot Science and Technology Project (Class B), and the Chinese Academy of Sciences Scientific Research Instrument and Equipment Development Project
.
The high-order harmonic light source part was assisted by associate researcher Zhao Kun, researcher Wei Zhiyi of the Key Laboratory of Photophysics (Group L07), and co-trained doctoral students Wang Ji and Xu Siyuan
Figure 1 Full map of laboratory equipment
Figure 2 Measurement of unoccupied state of topological insulator Bi 2 Se 3
2 3Figure 3 Band dynamics process of CDW material 1T-TiSe 2 (T=87K)
2Figure 4 Integrated control system