ARPES Studies of High-Temperature Superconductors

TYPECondensed Matter Seminar
Speaker:Dr. Ming Shi
Affiliation:Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
Organizer:Amit Keren
Time:11:30 - 12:30
Location:Lidow 724
Abstract:Angle-resolved photoemission spectroscopy (ARPES) has been proven to be a powerful tool for the investigation of electronic structure and energy gaps in high-temperature superconducting materials. After a briefly introduction about synchrotron-based ARPES which covers photon energy from UVU light to soft x-ray, I will present some of our recent ARPES results on cuprate and iron-based high-temperature superconductors. For cuprates, I shall show how the underlying Fermi surface, the superconducting and pseudogaps evolute from a highly underdoped samples to overdoped ones. For pnictides, I will focus on high-resolution measurements of the superconducting gap, as a function of crystal momentum. Our results strongly suggest that the pairing mechanism of the pnictides is mainly driven by the short-range antiferromagnetic fluctuations, similar to the case of high-Tc cuprate superconductors.