Designing and studying electrical switches based on armchair graphene nanotubes: A quantum chaos approach

A study of tunable metal-insulator transition is performed by using a quantum chaos analysis for a single-walled armchair carbon nanotube that is affected by a random distribution of substitutional nitrogen atoms. Carbon nanotubes have recently attracted more attention as promising materials for flexible nanoelectronic application. Our results unveil that disorder nanotube shows a gradual transition from metal to insulator phase in the prescene of a external electric field which is applied along the tube axis. By defining the threshold value of concentration of impurity and the electric field for metal-insulator transition, carbon nanotube may be used as a switch in electronic devices. Our finding are obtained by calculating the inverse participation ratio of a nearest -neighbor tight-binding Hamiltonian. Also, we performed quantum chaos theory for detailed understanding of a dynamic phase transition from metalic (chaotic) to insolator (Poisson).