Conductance triplication in the nanoscroll with magnetic flux

Ching-Hao Chang^1,2*, Yu-Jie Zhong^1,2, Xuan-Fu Huang^1,2

¹Physics, National Cheng Kung University, Taiwan
²Center for Quantum Frontiers of Research and Technology (QFort), National Cheng Kung University, Taiwan

* Presenter:Ching-Hao Chang, email:cutygo@phys.ncku.edu.tw

In a graphene-based nanoarchitecture, the topological valley states are the Dirac cone-like ground states with topological merit in electronic transport. They primarily exist at a particular interface, namely the domain walls between AB- and BA-stacked bilayer graphene, to provide quantum transport robust against material disorder. In this work, we theoretically establish the emergence of robust topological valley states and also the multiplication of conductance when a graphene ribbon rolls up into a two-winding carbon nanoscroll – a well-built-up radial superlattice with unique boundary condition including an interlayer periodicity and opened endpoints. Notably, we find that its conductance increases 300 % and becomes extremely robust against the lattice defects when the external magnetic flux is applied. Our results offer new pathways for spatially creating topological valley states in the curved graphene-like nanomembrane. The significance of these states is that their nature, number, and robustness are artificially controllable by applying magnetic flux.

Keywords: radial superlattice, nanotube, magnetic flux, topological states