Electronic structure and nematic phase transition in superconducting multiple-layer FeSe films grown by pulsed laser deposition method

Shen Bing^{1, 2}, Feng Zhong-Pei^{1, 2}, Huang Jian-Wei^{1, 2}, Hu Yong^{1, 2}, Gao Qiang^{1, 2}, Li Cong^{1, 2}, Xu Yu^{1, 2}, Liu Guo-Dong¹, Yu Li¹, Zhao Lin^{1, †}, Jin Kui^{1, ‡}, Zhou X J^{1, 2, 3, §}

Band structure comparison for the three S4K, S9K and S14K samples. The left panel shows the data measured at 30 K while the right panel shows the data measured at 150 K. (a1)–(a3) show band structure measured at 30 K for the S4K sample along momentum cuts crossing , M2 and M3, respectively. The location of the three momentum cuts is the same as that shown in Fig. 1(a1). 1(a4)–(a6) and (a7)–(a9) show band structures along the three momentum cuts measured at 30 K for the S9K and S14K samples, respectively. (b1)–(b3), (b4)–(b6) and (b7)–(b9) show band structure measured at 150 K along the three momentum cuts for the S4K, S9K and S14K samples, respectively. The images are all obtained by taking second derivative with respect to energy on the original data.