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Magnetization-Induced Higher-Order Topological Effects in Quantum Spin Hall Insulators 认领 引用
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作者 Xiang-Long Yu Jie Wang +2 位作者 Pei-Hao Fu Da-Yong Liu Dao-Xin Yao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期135-138,I0106-I0114,共4页
Higher-order topological phases offer a promising platform for low-dissipation electronic and spintronic devices,motivating the search for experimentally accessible control schemes.Here we investigate higher-order top... Higher-order topological phases offer a promising platform for low-dissipation electronic and spintronic devices,motivating the search for experimentally accessible control schemes.Here we investigate higher-order topological states in a rhombic geometry of two-dimensional group-IVA materials subjected to external magnetic fields,described by a modified Kane-Mele model with next-nearest-neighbor Rashba spin-orbit coupling.We identify two distinct types of corner modes governed by different physical mechanisms:under out-ofplane magnetization,corner states emerge at the acute angles due to boundary hybridization induced by spin-orbit coupling,whereas under in-plane magnetization,corner modes appear at the obtuse angles as topologically protected Jackiw-Rebbi solitons arising at the domain wall between boundaries with different topological invariants.Using first-principles-based parameters for realistic materials including silicene,germanene,and stanene,we show that the obtuse-angle corner states are robust and enhanced in systems with stronger spin-orbit coupling.Our results establish a feasible route for magnetically creating and controlling higher-order topological states,enabling reconfigurable corner-mode-based topological devices. 展开更多
关键词 corner modes external magnetic fieldsdescribed identify two distinct types corner modes external magnetic fields physical mechanisms magnetization quantum spin hall insulators experimentally accessible control schemeshere
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