报告题目：Resonant x-ray scattering from quantum materials

报 告 人：Bernhard Keimer, Max Planck Institute for Solid State Research, Stuttgart, Germany

报告时间：2018-07-17 10:30

报告地点：理科楼郑裕彤讲堂

报告摘要：This talk will start by a general introduction to the field of “quantum materials”, including particularly metal oxides that exhibit a large variety of quantum collective phenomena such as superconductivity and complex magnetism [1]. We will then describe how resonant elastic and inelastic x-ray scattering (REXS and RIXS) yield comprehensive, energy- and momentum resolved information about the ground state and excitation spectra these materials. The unprecedented sensitivity of RIXS now allows experiments on dispersive excitations in monolayers and microcrystals of complex quantum materials that were hard to imagine just a few years ago. We will go through several examples where REXS and RIXS have yielded qualitatively new insights: - spin and charge order and dynamics in copper oxides, and their influence on superconductivity, - orbital, spin, and charge order and dynamics in nickel-oxide films and superlattices, and - initial RIXS experiments on dispersive magnetic excitations in 4d metal-oxides.

[1] For recent reviews, see B. Keimer et al., Nature 518, 179 (2015); B. Keimer & J.E. Moore, Nature Physics 13, 1045 (2017)