2018/04/12 by Qiyue Wang, Cheng-Cheng Liu, Yuan-Ming Lu +1 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.121.186801
published as Phys. Rev. Lett. 121, 186801 (2018) · 6 pages, 3 figures, 1 table
arxiv created 2018/04/12 · arxiv updated 2018/11/01
Majorana bound states often occur at the end of 1D topological superconductor or at the π Josephson junction mediated by a helical edge state. Validated by a new bulk invariant and an intuitive edge argument, we show the emergence of one Majorana Kramers pair at each corner of a square-shaped 2D topological insulator proximitized by an s_±-wave (e.g., Fe-based) superconductor. We obtain a phase diagram that emphasizes the roles of bulk parameters and edge orientations. We propose several experimental realizations in lattice-matched candidate materials. Our scheme offers a high-temperature platform for exploring higher-order non-Abelian quasiparticles.