Speaker: 赵继民 (中国科学院物理研究所)

Time: April 19, 2016 10:00

Place: 理科楼三楼报告厅C302

报告摘要：Since the discovery of single-layer FeSe/SrTiO₃ interface high-Tc superconductivity by Professor Xue and his colleagues, various investigations have been carried out to elucidate its superconductivity mechanism. Here we demonstrate the evidence of superconductivity from ultrafast optical spectroscopy, using weak detection of the quasiparticle ultrafast dynamics. We obtain that Tc = 68 (-5/+2) K and Δ(0) = 20.2 ± 1.5 meV. Especially, from the quasiparticle lifetime, we directly obtain the e-phonon coupling constant λ = 0.48, which is three times of that in bulk FeSe.  We further find a 0.05 THz coherent acoustic phonon branch in the capping layer, which provides an additional decay channel to the gluing bosons.

报告人简介：赵继民，中国科学院物理研究所研究员，博士生导师，表面物理国家重点实验室。他于1995年和1998年在清华大学物理系分布获得学士和硕士学位，于2004年在密西根大学（安娜堡）物理系获得博士学位，经过博士后研究工作，于2007年回国到中科院物理所工作。他的研究兴趣主要是量子材料的超快动力学与相干光谱，研究超导体、拓扑量子态、二维材料等与光的相互作用，重点关注激发态的超快动力学和多自由度元激发的相干调控。