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.