High resolution angle-resolved photoemission spectroscopy on Cu-based and Fe-based high-T_c superconductors

摘要

Research on high temperature superconductivity has been a prominent topic in condensed matter physics. Angle-resolved photoemission spectroscopy (ARPES) is a powerful technique in probing the electronic structure, energy gap and many-body effects in high temperature superconductors, and other materials. In this paper, we first introduce our effort in developing vacuum ultra-violet (VUV) laser-based photoemission techniques, including angle-resolved, spin-resolved, time-of-flight electron energy analyzer-based ones. Then, we highlight some of our recent results on Cu-based high temperature superconductors utilizing our VUV laser-based ARPES including many-body effects in hole- and electron-doped cuprates, superconducting gap and pseudogap, and the observation of Fermi pockets. In the last part of this paper, we briefly introduce our ARPES study on band structure, Fermi surface, superconducting gap, and many-body effects in the newly discovered Fe-based compounds.