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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.55: Poster

Dienstag, 10. März 2026, 18:00–20:00, P1

Tenfold Conductance Enhancement in Graphene Nanoscrolls via Interlayer Hopping — •Jia-Cheng Li¹, Yu-An Cheng², Ying-Je Lee², Xuan-Fu Huang², Yu-Jie Zhong², Carmine Ortix³, and Ching-Hao Chang² — ¹Program on Key Materials, Academy of Innovative Semiconductor and Sustainable Manufacturing, National Cheng Kung University, Tainan 70101, Taiwan — ²Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan — ³Institute for Theoretical Solid State Physics, IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany

Rolling a graphene nanoribbon into a nanoscroll, a radial superlattice, offers a simple yet powerful way to control electronic transport at the nanoscale. In this work, we show that a one-turn nanoscroll exhibits a dramatic enhancement of quantum conductance compared to a flat ribbon, reaching nearly an order of magnitude in our tight-binding transport calculations. This effect does not rely on curvature-induced gauge fields or external perturbations. Instead, it arises purely from interlayer hopping at the overlapping edges of the scroll, which hybridizes the zigzag edge states and reconstructs the low-energy band structure. The resulting collapse of the flat bands reduces the density of states and shifts the Fermi level upward at fixed carrier density, activating multiple propagating modes. As the number of turns increases, these effects gradually weaken. Our findings identify nanoscrolls as a tunable geometry-driven platform for engineering transport in low-dimensional carbon systems.

Keywords: Radial Superlattice; Graphene; Intrlayer Coupling; 1-D conduction channel; Edge State