2023/05/01(Mon) 14:00 -16:00 一樓演講廳 1F, Auditorium
Title
Charge transport signatures in topological phases of matter
Abstract
Topological system is an emerging and intriguing field, showing remarkable new physical phases and quantum phenomena. In a topological system, nontrivial bulk band topology is accompanied by the presence of unusual surfaces, forming a special bulk-surface correspondence. Several surface sensitive tools had been utilized with great successes to reveal such unusual surface states in various topological systems. However, the experimental demonstration of the 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 detrimental for topological nodal systems. In this presentations, we will review our experimental efforts on demonstrating charge transport signatures in two topological systems. The first is the quantum anomalous Hall effect in magnetic topological insulator due to the unique chiral edge modes. The second system is the revelation of unique Weyl-orbit quantum oscillations in Weyl metal SrRuO3 thin films arising from the Fermi-arc surface states. At last, I will also briefly present our recent observations of nonlinear and nonreciprocal transport effects in Weyl metal SrRuO3 thin films, supporting for the existence of the Berry curvature dipole and zero-energy chiral edge modes in a topological Weyl semimetal. Those results were possible only for thin films with ultra-low defect level grown by molecular beam epitaxy technique, and the demonstration of charge transport signatures forms an important basis for future quantum technology using topological phases of matter.
Poster
Language
演講語言 (Language): in English
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