论文标题
非对基疾病增强了用激光照射的石墨烯的拓扑特性
Non-diagonal disorder enhanced topological properties of graphene with laser irradiation
论文作者
论文摘要
激光辐照是对电子系统调整拓扑特性的多功能工具，正在密集研究中。在实验上，已经观察到激光辐照在石墨烯中诱导异常的霍尔效应（McIver等，Nat。Phys。16，38（2020））。疾病在实际材料中无处不在，并且已经表明，对角疾病（即现场疾病）可以增强时间隔离驱动的量子材料的拓扑特性（Titum等，Phys。Phys。Rev.Lett。114，056801（2015））。在这里，我们研究了具有非对角性疾病的循环极化激光辐照石墨烯，即无序的隧道，发现疾病可以诱导以Bott Index和Realpace Chern数量为特征的非平凡拓扑特性。此外，我们表明，可以非绝热地打开激光辐射，以将无序石墨烯推向非平凡的拓扑阶段。这是一种针对实验实现特别有趣的方案。
Laser irradiation, as a versatile tool to tune topological properties of electronic systems, is under intensive studies. Experimentally, laser irradiation induced anomalous Hall effect in graphene has been observed (McIver et al., Nat. Phys. 16, 38 (2020)). Disorder is ubiquitous in real materials, and it has been shown that diagonal disorders, i.e., onsite disorder, can enhance topological properties of time-periodically driven quantum materials (Titum et al., Phys. Rev. Lett. 114, 056801 (2015)). Here, we investigate circularly polarized laser irradiated graphene with non-diagonal disorders, i.e., disordered tunneling, and find that disorder can induce nontrivial topological properties, characterized by Bott index and the real-space Chern number. Moreover, we show that one can turn on the laser irradiation non-adiabatically to drive the disordered graphene into non-trivial topological phase. It is a scheme which is especially interesting for experimental implementations.
