Abstract
The cover image shows a semi-classical model of quantum spin Hall (QSH) effect, where the bulk of a two-dimensional system is insulating and counter-propagating spin-polarized electrons move along its edges without dissipation. The edge states are protected by time-reversal symmetry and insensitive to disorders. The unique edges of QSH materials provide a route to generate and detect Majorana fermions, which is a possible solution on quantum computing. In article number 1900026, Chuanwu Cao and Jian-Hao Chen review the development of the understanding and construction of the QSH states with an emphasis on the materials perspective.
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