Topological and Topographical Orders in Twisted Graphene: Pathways to Quantum and Electronic Innovations

Abstract

Graphene has recently attracted considerable attention across fundamental science and engineering disciplines due to its exceptional properties, including superior electrical conductivity, thermal stability, optical transparency, and mechanical strength. These characteristics have positioned graphene as a key material in the advancement of next-generation electronic technologies.

In this paper, we present a comprehensive overview of graphene’s electronic and thermal properties, emphasizing its high conductivity, the quantum Hall effect, Dirac fermions behavior, high thermo power, and phenomena associated with magic-angle Twisted Bilayer Graphene (TBG). We also highlight emerging applications of twisted bilayer graphene in optical devices, electronic components, and thermal sensors. These developments hold great promise for future advancements in biomedical engineering, targeted therapies, environmental monitoring, and even fundamental physics.

A particularly compelling aspect of graphene is its topological order, which arises from its unique band structure. Unlike conventional conductors that facilitate free electron flow throughout the bulk, topologically ordered graphene supports robust edge states—conductive channels at the boundaries of two-dimensional systems that remain stable despite impurities or defects in the bulk material. This resilience is rooted in the material’s topological band structure and reflects principles from topology, the mathematical study of spatial properties preserved under continuous deformation.

Topological order in graphene exhibits remarkable resistance to environmental perturbations, making it a strong candidate for quantum electronic devices and quantum computing applications, particularly in preserving qubit coherence. Additionally, topographical order, including surface roughness and morphological features, plays a role in stabilizing edge states and influencing electronic behavior. Together, the topological and topographical orders enhance graphene’s potential for long-term quantum information retention.

This study explores the synthesis and characterization of twisted graphene structures, demonstrating significant enhancements in electronic performance. Structural and compositional properties were investigated using advanced techniques such as X-ray Diffraction (XRD), UV-Visible spectroscopy, Raman spectroscopy, Field-emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), and Atomic Force Microscopy (AFM). The results confirm that graphene’s unique electrochemical and mechanical features contribute to its robust electronic states.