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. It also provides key insights on other quantum materials. In this talk, I will first introduce the present status of high temperature superconductivity research, followed by a brief introduction on the latest development of photoemission techniques. Finally, I will highlight some of our recent results in utilizing the state-of-the-art laser-based ARPES to study the high temperature cuprate superconductors [1-3], iron-based superconductors [4-9], and other quantum materials [10-12]. [1]Yingying Peng et al., Nature Communications 4, 2459(2013). [2] Junfeng He et al., Physical Review Letters 111, 107005 (2013). [3] Jinmo Bok et al., Science Advances 2, e1501329 (2016). [4] Defa Liu et al., Nature Communications 3, 931 (2012). [5] Shaolong He et al., Nature Materials 12, 605 (2013). [6] Xu Liu et al., Nature Communications 5, 5047 (2014). [7] Junfeng He et al., PNAS 111, 18501 (2014). [8] Lin Zhao et al., Nature Communications 7, 10608 (2016). [9] Defa Liu et al., Phys. Rev. X 8, 031033 (2018) [10] Zhuojin Xie et al., Nature Communications 5, 3382 (2014). [11] Ya Feng et al., PNAS 133, 14656 (2016). [12] Yan Zhang et al., Nature Communications 8, 15512 (2017).