Non-diagonal disorder enhanced topological properties of graphene with laser irradiation

Abstract

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.

arXiv comment5 pages, 5 figures

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Cited by in corpus (4)

• Light-induced phase crossovers in a quantum spin Hall system
• Generation of higher-order topological insulators using periodic driving
• Time evolution of Majorana corner modes in Floquet second-order topological superconductor
• Josephson current signature of Floquet Majorana and topological accidental zero modes in altermagnet heterostructures