Yeom Han-woong is Director of Center for IBS Center for Artificial Low Dimensional Electronic Systems and a professor at Pohang University of Science and Technology (POSTECH). He earned his Master’s degree in physics from POSTECH in 1991, followed by Ph.D. from Tohoku University in 1996. His research team has investigated the quantum properties of new low-dimensional electronic systems that are atomically created and controlled. He serves as Vice-Chair of the Presidential Advisory Council of Science and Technology of Korea and provides policy advice on the direction and agenda of national technology policy.
Solitons or domain walls in low dimensional materials play important roles to govern physical properties and functionalities. Here, I review recent progress on the atomistic investigation of solitons and domain wall excitations in 1D and 2D charge density wave (CDW) systems. The multiply degenerate ground states of the CDW systems lead to various different soliton or domain wall configurations, which have rich internal degrees of freedom in atomic, electronic, and topological structures. These degrees of freedom provide interesting prospects in utilizing solitons and domain walls in delivering and manipulating topologically protected information, which is dubbed as ‘solitonics’.