论文标题
杂质状态和辐照石墨烯中的间接交换相互作用
Impurity States and Indirect Exchange Interaction in Irradiated Graphene
论文作者
论文摘要
从理论上讲，我们研究了由非谐振圆极化光场驱动的石墨烯中磁杂质之间的杂质水平和交换相互作用。我们的分析捕获了具有磁性杂质具有很强现场电位的散射而产生的非扰动作用。在辐射下，动态带隙在狄拉克点打开，使杂质水平存在于间隙内。这些杂质水平被证明会引起与位于相同或不同sublattices的杂质的交换能量的共振功能。交换相互作用还显示了由于照射引起的抗铁磁行为的空间范围。我们的工作表明，石墨烯中磁杂质的交换能量在存在强势散射的情况下通过光照射可广泛调节。
We theoretically investigate the impurity levels and exchange interaction between magnetic impurities in graphene driven by an off-resonant circularly polarized light field. Our analysis captures the non-perturbative effects resulting from scattering with magnetic impurities with a strong onsite potential. Under irradiation, a dynamical band gap opens up at the Dirac point, allowing impurity levels to exist inside the gap. These impurity levels are shown to give rise to a resonance feature in the exchange energy for impurities located either at the same or different sublattices. The exchange interaction also shows a wider spatial range of antiferromagnetic behavior due to irradiation. Our work demonstrates that the exchange energy of magnetic impurities in graphene is extensively tunable by light irradiation in the presence of strong potential scattering.
