| Time：1131016 (Wed.) 14:20~16:20 Speaker：Prof.李偉立(Lee, Wei-Li) 中央研究院物理研究所/Institute of Physics, Academia Sinica Title：Revealing surface charge transport in thin films of topological Weyl metal SrRuO3 Abstract：In a topological system, nontrivial bulk band topology is accompanied by the presence of unusual surface states, forming a special bulk-surface correspondence. Several surface-sensitive tools have been utilized with great success to reveal such unusual surface states in various topological systems. However, the experimental demonstration of distinct charge transport signatures for surface states in topological systems remains a grand challenge due to the overwhelming contributions from the bulk states and impurity states, which is particularly difficult for topological nodal systems. In this presentation, I will review our recent experimental efforts in demonstrating surface charge transport signatures in topological Weyl metal SrRuO3 thin-film system. First is the revelation of unique thickness dependent Weyl-orbit quantum oscillations associated with the Fermi-arc surface states. Secondly, I will present our recent observations of large nonreciprocal and nonlinear charge transport effects at low temperatures. These results were possible only for thin films with an ultra-low defect level grown by oxide molecular beam epitaxy technique, and the demonstration of charge transport signatures forms an important basis for future quantum technology using topological phases of matter. Place：B101, Gongguan Campus, NTNU |
