报告题目:ARPES Studies on Bi-2212
 
报告人:Inna Vishik, Stanford University
 
报告简介:Bi2Sr2CaCu2O8+(Bi-2212) is a compound which is amenable to study by angle-resolved photoemission spectroscopy (ARPES) because it cleaves easily, has sharp line shapes, and has relevant energy scales which are accessible to modern instruments. Despite the large volume of previous ARPES work on this system, Bi-2212 continues to provide insights about the high-temperature cuprate superconductors.I will discuss two of our recent experiments. The first work focuses on the discrepancy between recent quasiparticle interference STM experiments and ARPES data: while the former sees evidence of interfering quasiparticles over a limited region of the Fermi surface, ARPES sees sharp quasiparticle peaks all around the Fermi surface. I will discuss the ubiquity of sharp quasiparticles in ARPES data, and explain why they may not contribute to QPI in all regions of momentum space. Second, I will discuss our recent experiments using laser-based ARPES, which allows for superior resolution and signal strength.Laser ARPES is able to resolve a small kink at very low energies in the nodal dispersion of Bi-2212, and the doping dependence of this kink has implications for understanding thermodynamic measurements.
 
报告人简介:
 
*Stanford University, Stanford, CA (Sept. 2006-present)
 Ph.D student, Applied Physics
 
*Stanford University, Stanford, CA (April 2005 – June 2006)
Master of Science, Materials Science and Engineering
 
*Stanford University, Stanford, CA (Sept. 2002 – June 2006)
 Bachelor of Science, Physics, with honors
 
*Honors Thesis: Quantum impurities in the electron-doped high-temperature superconductor Neodymium Cerium
 Copper Oxide: crystal growth, characterization,and magnetic neutron scattering
 
报告时间:2009年12月16日(星期三)上午10:00
 
报告地点:物理所D210会议室
 
联系人:周兴江研究员 / 8264-8176