超导国家重点实验室学术报告

报告题目：Resonant Inelastic X-ray Scattering study of Magnetic Excitations in high-Tc cuprate superconductors

 报告人：Dr. Yingying Peng

Dipartimento di Fisica, Politecnico di Milano, I-20133, Italy

报告时间：2017年12月5日（星期二）下午2:00-4:00
报告地点：M236会议室

 联系人： 周兴江 / 8264-8176

报告摘要：

        Resonant Inelastic X-ray Scattering (RIXS) is a photon-in and photon-out technique which becomes popular in recent years due to the fast progress in the instrumentation and by importanttheoretical achievements. RIXS can be used in a very effective way to study the charge and spin excitations in strongly correlated 3d transition-metal systems.

In this seminar,I will briefly review the improvement of resonant soft X-ray Scattering instruments and the main achievements of RIXS (i.e. magnetic excitations, charge order and phonons) in recent years. The focus of the talk will be RIXS study ofmagnetic excitations in cuprate high-T_c superconductors.We use high resolution RIXS to determine therelation between crystal structure and the extent of hopping integrals in parent compounds, revealing whyapical oxygens are detrimental to superconductivity. Moreover, we use high resolution RIXS andnumerically exact determinant quantum Monte Carlo (DQMC) methodto study the dispersions, damping and intensity of spin excitations inone family of high-temperature superconductor, providing compellingevidence that spinexcitations persist across the superconducting dome of cuprate phase diagram.

报告人简介：

Yingying Peng(彭莹莹) received her BS (2008) from Wuhan University and PhD from Institute of Physics,Chinese Academy of Sciences (2013). From 2013 to 2017, she has worked as a postdoctoral fellow in Polytechnic University of Milan, Italy. From 2015 to 2017, she was also a visitor in beamline ID32 (soft X-ray spectroscopy), ESRF, France. She was responsible for the optical design of resonant inelastic X-ray scattering(RIXS)spectrometer for European X-ray free-electron laser (XFEL), Germany.She is experienced in angle-resolved photoemission spectroscopy (ARPES) and RIXS study ofstrong correlated materials. She has published more than 30 peer-reviewed articles. Recently, she is using high-resolution RIXS to study the charge, spin, orbital and lattice excitations and their interplays incuprate superconductors.