Overview

This book reveals unique transport phenomena and functionalities in topological insulators coupled with magnetism and superconductivity. Topological insulators are a recently discovered class of materials that possess a spin-momentum-locked surface state. Their exotic spin texture makes them an exciting platform for investigating emergent phenomena, especially when coupled with magnetism or superconductivity. Focusing on the strong correlation between electricity and magnetism in magnetic topological insulators, the author presents original findings on current-direction-dependent nonreciprocal resistance, current-induced magnetization reversal and chiral edge conduction at the domain wall. In addition, he demonstrates how the coupling between superconductivity and topological surface state leads to substantial nonreciprocal resistance. The author also elucidates the origins of these phenomena and deepens readers’ understanding of the topologically nontrivial electronic state. The book includes several works which are published in top journals and were selected for the President’s Award by the University of Tokyo and for the Ikushi Prize, awarded to distinguished Ph.D. students in Japan.

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9789811571824

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Kenji Yasuda is a postdoctoral fellow at the Massachusetts Institute of Technology. He joined the group led by Professor Yoshinori Tokura in the Department of Applied Physics in April 2014, receiving Ph.D. in engineering from the University of Tokyo in September 2018. For his seminal work, he received JSPS ikushi prize and a President’s award of the University of Tokyo. His work is concerned with the electronic devices of 2D and 3D topological insulator thin film and thin flakes. He is interested in the emergent transport phenomena and the control of the quantum electronic states in topological materials.

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