低维量子物理国家重点实验室杰出学者讲座
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)
Bio：Bernhard Keimer教授是强关联量子材料能谱学领域的国际知名专家，在铜氧化物、氧化物界面、铁基高温超导等关联体系利用中子散射和X射线技术做出了一系列开创性工作。Keimer教授1991年于麻省理工学院物理系获得博士学位，并于1997年获得普林斯顿大学终身教授。1998年至今，Keimer教授担任德国马克思普朗克固态研究所所长，斯图加特大学名誉教授。Keimer教授曾荣获德国科学基金的莱布尼茨奖(Leibniz Prize)等诸多奖项，并且是Thomson Reuters评出的高引学者。 |
