论文标题
电场诱导的石墨烯纳米纤维中锯齿形边缘磁性的双重性
Bistability of zigzag edge magnetism in graphene nanoribbons induced by electric field
论文作者
论文摘要
在哈伯德相互作用的情况下，石墨烯曲折纳米骨具有自发的边缘磁性，具有反行构型，其振幅可以通过横向电场来调节。随着电场的临界值增加或减小，边缘分别被消除或重新磁性。每个边缘的磁场决定重新磁化的方向。因此，单层石墨烯曲折纳米替伯苯二层中缓慢变化的横向电场和磁场的组合可以将量子系统驱动到双重环路中。可以在没有磁场的双层/单层锯齿形纳米替比中诱导相同的现象，因为非对称性superexchange相互作用控制着重新磁化的方向。通过这种方式，量子系统在基态和准稳定的激发状态之间切换，具有不同的磁性，带结构和电导。此功能可用于开发基于石墨烯的无磁场的纳米驱动器。
In the presence of the Hubbard interaction, graphene zigzag nanoribbons have spontaneous edge magnetism with anti-parallel configuration, whose amplitude can be tuned by a transversal electric field. As the electric field increases or decreases across a critical value, the edges are demagnetized or re-magnetized, respectively. A magnetic field at each edge determines the orientation of the re-magnetization. Thus, a combination of slowly varying transversal electric field and magnetic field in monolayer graphene zigzag nanoribbon could drive the quantum system into a bistability loop. The same phenomenon can be induced in a bilayer/monolayer zigzag nanoribbon without the magnetic field, because the non-symmetry superexchange interaction controls the orientation of the re-magnetization. By this way, the quantum system is switched between ground state and quasi-stable excited state with different magnetism, band structures and conductance. This feature could be used to develop graphene-based spintronic nano-devices without magnetic field.
