The Paul Scherrer Institute (PSI) runs Switzerland's Large-Scale research facilities for users from the domestic and international scientific community, and is one of only two locations in the world providing the three complementary probes of synchrotron and free electron laser X-rays, neutrons and muons at one site. The Swiss Light Source (SLS) at PSI provides photon beams of high brightness for research in condensed matter physics and materials science, as well as biology and chemistry. In this presentation, I will first introduce various synchrotron-based techniques at SLS, ranging from imaging, microscopes, X-ray absorption to diffraction, elastic/inelastic soft X-ray scattering and photoemission spectroscopy. Then, I will present our recent works on direct visualizations of topological quantum states in a topological Kondo insulator candidate and Weyl semimetals by using angle-resolved photoemission spectroscopy (ARPES) and its spin-resolved variant (SARPES). 

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　　史明，瑞士保罗谢尔联邦研究所资深研究员，1996年获得瑞士日内瓦大学物理学博士学位，1996-1998年在瑞士保罗谢尔联邦研究所做博士后，1998年留所工作至今，2004-2005年在美国伊利诺大学芝加哥分校做访问学者，2012任中国科学院物理所兼职教授。主要从事的研究方向有高温超导体、强关联体系、拓扑量子材料等。近年来在Nature Physics、Physical Review Letters、Nature Communications等期刊上发表了多篇文章。