论文标题
通过rkky交流相互作用探测锯齿石墨烯纳米替烯中的分区缺陷
Probing divacancy defects in a zigzag graphene nanoribbon through RKKY exchange interaction
论文作者
论文摘要
我们通过利用绿色的功能形式形式与紧密结合的汉密尔顿人结合使用，研究了空缺缺陷对锯齿烯石墨烯纳米纤维（ZGNR）的电子和磁性的影响。解释了间接交换耦合的演变，称为Ruderman-Kittel-Kasuya-Yosida（Rkky）相互作用，包括单个，双重和多个5-8-5的分区缺陷。我们的数值计算表明，电子结构的变化和ZGNR的交换耦合显着取决于相对于功能区边缘的分区缺陷的位置以及分区缺陷的数量。在这种情况下，这两个杂质都位于边缘，交换耦合的大小是几个数量级的增强，当它们放置在纳米替比内部时。此外，周期性的分区会导致色带的磁接地状态发生巨大变化。在高空电位的极限下，rkky相互作用的强度大致与费米能量无关。
We investigate the effect of vacancy defects on the electronic and magnetic properties of zigzag graphene nanoribbons (zGNRs) by making use of the Green's function formalism in combination with the tight-binding Hamiltonian. The evolution of the indirect exchange coupling, known as Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, including single, double, and multiple 5-8-5 divacancy defects is explained. Our numerical calculations show that the changes in the electronic structure and the exchange coupling of zGNRs depend significantly on the location of the divacancy defects with respect to the ribbon edges and on the number of the divacancy defects. In the case both the impurities are located on the edge, the magnitude of the exchange coupling is several orders of magnitude strengthen that result when they are placed on the interior of the nanoribbon. Furthermore, a periodic divacancy causes a dramatic change in the magnetic ground state of the ribbon. In the limit of high vacancy potential, the strength of the RKKY interaction is approximately independent of the Fermi energy.
