We theoretically study indirect spin coupling strength between two magnetic impurities located on honeycomb Kane-Mele zigzag ribbon （KMZR） with periodic and open boundary （PB and OB）. We show that spin interaction...We theoretically study indirect spin coupling strength between two magnetic impurities located on honeycomb Kane-Mele zigzag ribbon （KMZR） with periodic and open boundary （PB and OB）. We show that spin interaction J in PB ribbons displays an AFM-FM oscillating behavior with increasing the staggered potential and electron density, and approaches to maximum at the edges. While the spin coupling in OB KMZR shows a trivial smooth AFM coupling with varying staggered potential. Such a novel J（ A） behavior is the combining effect of finite size, topological edge states and inversion symmetry breaking induced by the staggered potential. We propose that one could control the edge magnetism electrically in two-dimensional buckled honeycomb materials, e.g., silicence, germanene and stanene.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11074257 and 11274310, and the Hefei Center for Physical Science and Technology under Grant No 2012FXZY004.
文摘We theoretically study indirect spin coupling strength between two magnetic impurities located on honeycomb Kane-Mele zigzag ribbon （KMZR） with periodic and open boundary （PB and OB）. We show that spin interaction J in PB ribbons displays an AFM-FM oscillating behavior with increasing the staggered potential and electron density, and approaches to maximum at the edges. While the spin coupling in OB KMZR shows a trivial smooth AFM coupling with varying staggered potential. Such a novel J（ A） behavior is the combining effect of finite size, topological edge states and inversion symmetry breaking induced by the staggered potential. We propose that one could control the edge magnetism electrically in two-dimensional buckled honeycomb materials, e.g., silicence, germanene and stanene.
