Laser ARPES on High Temperature Superconductors and Quantum Materials

The mechanism of high temperature superconductivity in the copper-based and iron-based superconductors remains a prominent and challenging issue in condensed matter physics. Angle-resolved photoemission spectroscopy (ARPES), as a powerful technique to directly probe the electronic structure of materials, has played a key role in studying high temperature superconductors, as well as other quantum materials. In this talk, I will first briefly introduce ARPES technique, in particular, the latest development of vacuum-ultra-violet (VUV) laser-based ARPES systems [1]. Then I will highlight some ARPES results on topological materials including Bi₂Se₃ [2], monolayer silicene[3] and ZrTr₅ [4]. Finally, I will report some of our recent results in utilizing the state-of-the-art laser-based ARPES to study high temperature cuprate superconductors [5-7] and iron-based superconductors [8-11].

1. X. J. Zhou et al., Rep. Prog. Phys. 81, 062101 (2018).
2. Zhuojin Xie et al., Nature Communications 5, 3382 (2014).
3. Ya Feng et al., PNAS 133, 14656 (2016).
4. Yan Zhang et al., Nature Communications 8, 15512 (2017).
5. Yingying Peng et al., Nature Communications 4, 2459(2013).
6. Junfeng He et al., Physical Review Letters 111, 107005 (2013).
7. Jinmo Bok et al., Science Advances 2, e1501329 (2016).
8. Defa Liu et al., Nature Communications 3, 931 (2012).
9. Shaolong He et al., Nature Materials 12, 605 (2013).
10. Lin Zhao et al., Nature Communications 7, 10608 (2016).
11. Defa Liu et al., Phys. Rev. X 8, 031033 (2018)